Muscle+System

The Cool Muscular System Muscle system is your life. If you didn’t have it, you would have been a skeleton lying down.

The Muscular system is made up of muscle tissues. The muscles are all over our body. It is one of the most important systems that everybody must have. If someone does not have this system, they will not be able to stand up. All muscles in the muscle system are like meat. There are 3 types of muscles. They each have really important jobs. They are the skeletal muscle, the smooth muscle, and cardiac muscle.

There are tendons and ligaments which connects the system. Tendons and ligaments are like glues in our body. “Tendons” keep the muscle joint to the bones. “Ligaments” connects bones to bones, so ligaments are a part of the skeletal system. They are like glues for our body. We need this to be in our body, or else we will not be able to move or to be able to stand.

There are 3 types in the muscular system. The skeletal muscle move and support the skeleton. They are the same as the skeleton. The smooth muscle is found in the hollow parts of our body such as stomach, intestines, blood vessels and the bladder. The last one is the cardiac muscle. The heart is a muscle, and it is the cardiac muscle. Our heart beats nonstop 100,000 times each day. Heart only stops beating when you die. The cardiac muscle contracts automatically, and relaxes back. Muscles always work in partners.

Skins are on top of our muscles, and there are furs on our skin to protect our skin. Skins are all over our body, and it is also the biggest organs in our body. Skins are divided into 3 layers. They are the epidermis, dermis, and the hypodermis. All of the 3 layers have a job to protect our body. Before that, the epidermis is the outer layer and the dermis is the middle layer. Hypodermis is the inner layer. Deep into the hypodermis, we can see our body circuit. Without skin, you will just be a big bag of meat. Epidermis, the outer layer covers the entire body from head to toe. In one way, we can say that it acts as a barrier. Dermis holds sweat glands, blood vessels, hair follicles, nerves, and more. The hypodermis, the main job is the temperature control. The skin is the most important organ you must have, even though there are a lot more.

The largest muscles in our body are in our butt. Muscles are just like machines. There are over 600 separate muscles in our body. Muscles are bundle of cells and fibers. Our muscles only pull and not push. Muscles are mostly located in our hands and feet. Most of our muscles work in pairs. There is a ball and socket joint in our body which allows free movement.

There are voluntary and involuntary muscles in our body. Voluntary muscles are muscles that can be used if you are told, but involuntary muscles are muscles that can’t be move when you are told. For some examples, if you were told to show your arm muscles, you can probably show because popping you muscles from the arms are voluntary. Not blinking eyes, stop heart from beating are involuntary muscles. We must have both of them because we can’t control every part of our body.

Most importantly, muscles are necessary. Don’t use 43 muscles just for frowning. Use 17 muscles to smile instead! When you eat meat, think that you are eating your muscles. Meat becomes muscles in your body. Don’t think you will be so nice and thin if you don’t have your muscle system.

Written by Ji Ae G5

The Muscular System>>Ink

Wonderful work of muscles!

What are the muscles in our body? Muscles are responsible for your body's every move. Muscles are just like machines. There are three kinds of muscles; there are skeletal muscles (voluntary muscles), smooth muscles, and cardiac muscles. These muscles are made up of group of muscle tissue bound together by connective tissue. As you observed in the investigation one muscle contracts to bend a joint. Another contracts to straighten it.

What do muscles do? Skeletal muscles move bones and hold your skeleton upright, such as those in your arms and legs, only work when you think about making them work. Skeletal muscles are voluntary muscles. Smooth muscles contract slowly and move substances through the organs they surround. Smooth muscles are in your intestine, stomach, bladder, and blood vessel. Cardiac muscles make up the walls of the heart. Their function is to pump blood. These two types of muscle are involuntary. They work without you having to think about it. These three muscles have different work to do.

About muscle cells! Muscles need oxygen and food for energy from your blood in order to work properly. If they work hard but do not get enough oxygen and food, they may go into a spasm and you feel the pain of the cramp. Muscles are bundles of cells and fibers. Muscles work in a very simple way. All they do is tightening up-that is, contract and relax. A muscle makes itself smaller when it contracts and larger when it relaxes. You have two sets of muscles attached to many of your bones which allow them to move your body.

<span style="display: block; font-family: Georgia,serif; margin: 0cm 0cm 0pt; text-align: left;">More about muscles! Muscles join to bones to move our body. Tendons connect the muscles to the bones. Ligaments connect bones to bones. Muscles can pull. They never push. You use 17 muscles when you smile and you use 43 muscles when you frown too. Each person has more than 600 muscles in human body. Muscles make up to 85% of your body weight. And 50% of your body weight comes from the skeletal muscles. Your strongest muscles are the masseters on each side of your mouth. They allow you to bite into things with a force of 73 kg. The biggest muscles in human body are your butt.

<span style="display: block; font-family: Georgia,serif; margin: 0cm 0cm 0pt; text-align: left;">The largest organ of the human body is skin. In the average adult it covers about 3000 square inches and weighs around six pounds, which is nearly twice the weight of the human brain or liver. The skin can regenerate and repair itself. Skin holds everything together. It also; protects our bodies, helps keep our bodies at just the right temperature, allows us to have the sense of touch, and also helps in the dissipation of sweat. There are three layers of the skin called the Epidermis, Dermis, and Hypodermis. The Epidermis is the outer layer, the Dermis is the middle layer, and the Hypodermis is the inner layer.

<span style="display: block; font-family: Georgia,serif; margin: 0cm 0cm 0pt; text-align: left;">Muscles are important because they help your body move. Three different muscles are skeletal muscles, smooth muscles, and cardiac muscles. These three muscles have different work to do. They need oxygen and food for energy to work. They usually join to the bones to make your body move. The masseters are the strongest muscles in your body. Muscles are covered by three layers of skin; Epidermis, Dermis, and Hypodermis.

<span style="display: block; font-family: Georgia,serif; margin: 0cm 0cm 0pt; text-align: right;">By: INK Grade 5

THIS IS MY ESSAY NATCHA...... <span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 0pt; text-align: center;">MUSCLES SYSTEM

<span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 0pt; text-align: center;">THERE ARE THREE TYPES OF MUSCLES AND EVERY ONE HAS THESE MUSCLES!!!!

<span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-align: left; text-indent: 1cm;">Bones and muscles work together aid body movement. We have 200 bones in our body. Your strongest muscles are master, they let your bite into things with a force of 73(160lb). Most of your bones are in your legs and hands. Most of your muscles are in your bum!!! <span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-align: left; text-indent: 1cm;">There are three layers of skin. Epidermis is your outer layer dermis is you middle layer and hypodermis is your last layer. What do these layers do? Epidermis covers the whole body from head to toe. Dermis holds all the blood vessel, nerves and hair glanols. The dermis is also responsible for catching bacteria, etc. Hypodermis helps to keep your body at the normal temperature and fatty deposits. <span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-align: left; text-indent: 1cm;">What are voluntary and involuntary muscles? Voluntary means you decide to do. Involuntary means you don’t decide. So the example of voluntary is- stand up or open your eyes. The example of involuntary is- stop your heart beating or stop your intestine to work, so you can’t decide to stop your heart. <span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-align: left; text-indent: 1cm;">What are ligament and tendons? Ligaments connect bones to bones. Tendons connect muscles to bones. Most of your muscles in your body in work pair. Our muscles can work by, pulling and relaxing. If you tendons are torn in your feet want will happen? Your feet won’t be able to walk. <span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-align: left; text-indent: 1cm;">There are three types of muscles in your body, skeletal muscles, smooth muscles and cardiac muscles. What do these muscles do? Skeletal muscles support and move the skeleton. Skeletal muscles are 50% of your body weight. Smooth muscles are found in hollow part of your body. This would be in places like- stomach, intestine, gladder and blood vessel. Cardiac muscles contract automatically to squeeze the walls of the heart inward. Cardiac muscles never are tired until you’re died.

====<span style="font-family: Georgia,serif; margin: 0cm 0cm 0pt;"><span style="color: #333333; font-family: 'Calibri','sans-serif'; text-indent: 1cm;">You have all the muscle fiber you will ever have at birth. Once the muscles are damaged they can’t be replaced. A single muscle cell of the Sartorius muscle in the thigh can be more than 12 inches long. There are more than 600 voluntary muscles in the body. The strongest muscle of the body is the master muscle used for chewing! Your hand contains 20 different muscles. If all your muscles could pull in one direction you could create a force of 25 tons! Muscles account for approximately 40% of your body weight. It takes 17 muscles in your face to smile, but it takes 43 muscles to frown. You take approximately 5 million steps per year using your leg muscles! <span style="font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-indent: 1cm;">**Bones and muscles work together aid body movement. Your strongest muscles are master, they let your bite into things with a force of 73(160lb). Most of your bones are in your legs and hands. Most of your muscles are in your bum!!! There are three layers of skin. Epidermis is your outer layer dermis is you middle layer and hypodermis is your last layer. Voluntary means you decide to do. Involuntary means you don’t decide. Ligaments connect bones to bones. Tendons connect muscles to bones. Most of your muscles in your body in work pair. Our muscles can work by, pulling and relaxing. There are three types of muscles in your body, skeletal muscles, smooth muscles and cardiac muscles.** ====

An Amazing System That Helps Us Move <Muscular System> The muscular system is made up with tissues. The muscular system works with skeletal system, for example, one muscle, the biceps bend our arms and another, the triceps straightens it. We are using 17 muscles to smile and while frowning, we use 43 muscles. Our muscles are attached to the bones by tendons. Working together, muscles, bones, and joints act as levers, giving us a wide range of movements. Over 30 muscles hold together 24 bones of our hand, allowing us to pick up something. There are about 640 muscles in our body. They make up to 85% of our body weight. There are 3 kinds of muscles. They are skeletal muscles, smooth muscles, and cardiac muscles. The skeletal muscles hold the bones together. Smooth muscles help different organs and tissues to perform different tasks. Cardiac muscles contracts and relaxes to make the heart work. Lying in bands just beneath the surface of the skin. The skin is the largest organ in our body. It’s made up with 3 layers. They are Epidermis that is outer layer, Dermis that is at the middle layer, and hypodermis that is inner layer. Epidermis covers entire body from head to toe. Dermis hup of all operation in our skin where a lot of action takes place, and holds all the blood vessels, nerves, hair folliclos, collagen, and sweat of glands. Hypodermis’ main job is to temperature controls. Voluntary muscles contraction is used to move the body, and be finely controlled. For example, we can stop walking (The movements we can stop). Voluntary muscle is another name for skeletal muscle. Involuntary muscles are smooth, unnucleated, non-branching muscles that are not directly controllable at will. For example, we can’t stop our heart from beating (the movements we can’t stop). A tendon is a tough band of fibrous connective tissue that usually connects muscle to bone. It also capable of with standing tension. Tendons are similar to ligaments. They are all made of collagen. Except that ligaments join one bone to another bone, and also fasciae connect muscle to other muscles. Tendons and muscles work together and can only exert a pulling force. The longest and the strongest tendon in our body is the Achilles in the heel. Ligaments is a short band of tough but flexible connective tissue that, in most cases. It holds two or more bones together at a movable joint. Ligaments restrain the movement of bones at a joint. Ligaments are two types. The majority are composed collagen fibers. The longest muscle in our body is the sartorius muscle. It starts from hip and extands to the knee. One of the strongest muscles is the gluten maximum located in the buttocks. Jaw and the tongue muscles are also strong muscles. Whether we are playing games, reading, writing, talking or walking, some muscles are always working! The more muscles work, the stronger it becomes. This is why people who exercise have a far more muscle tone than people who don’t exercise.

Radhika-g5 Muscles System-Radhika5 <Muscles are big and strong!>

Bone and muscles work together to aid body movement. We have around 200 bones in our body. Our legs have the longest bones together. Tendons connect muscles to the bones and ligaments muscles to muscles. When a person moves one muscle the other muscles also moves. If a person does not have bones he/she cannot walk. Teeth are the strongest bones in our skeleton bones in our skeleton. There are three bones in our ear. The hammer, the Anvil, and the stirrup are the three types of bones in our ear. There are over 600 separate muscles in our body. We have hinge joints. There are saddle joints too. There are socket and ball near to your shoulders. The real name for spine is __Vertebral__. There are some joints that don’t move at all. We only need 17 muscles to smile and 43 bones to frown, so keep smiling. A sparrow has more bones than giraffe in its neck. Birds have hollow bones, so they can fly. The biggest muscle in your body is your butt, but the right word for butt is __Gluteus Maximus__. YUCK!!! When you are a baby you have about 350 bones. An adult has 200 bones his/her body because some bones mix or joint together and form a big one. Your bones are stronger than aluminum air craft. A snake has 400 vertebrates. Muscle makes up 85%of your body weight. Human skeleton starts out as cartilage that hardens into bones over your entire life time. Bones are stronger than steel. There are three layers of skin and they are epidermis (1), dermis (2), hypodermis (3). The skin is a __large__ __organ__ in human body. Skin covers an adult about 3,000 square inches and weighs around six pounds, which is nearly twice the weight of the human branchor liver. Epidermis covers all of us. Dermis is the 2nd layer of our skin, it hups all of the operation in the skin where a lot of action takes place. Hypodermis, temperature is the main job because of the fatty deposits. The muscular system is made up of tissues that work with skeletal system to control movement of the body. Some muscles like the one in your arms and legs-are voluntary-meaning that you decide when to move them. Skeletal muscles move and support the skeleton. Skeleton muscle, such as those in your arms and legs, only work you think about making them work. For example, when you want to lift something or go for a run, your brain sends and receives signals through your nervous to make the muscles work. Cardiac Muscles cells are striped, like skeletal cells. Cardiac muscles contract automatically to squeeze the walls of the heart inward. The heart beats non-stop 100,000 times a day. Smooth muscles are not rough but are found in the hollow parts of the body. This would be in places like the stomach, intestines. Just because smooth muscles are called smooth muscles that doesn’t mean they are smooth. If tendons are torn, what will happen? Your strongest muscles are masseters on each side of your mouth. They allow you to bite into things with a force of 73kg (160lb). Did you know that when you eat meat it turns into muscles.

<span style="display: block; font-family: Calibri,sans-serif; text-align: center;">The Magnificent Muscle System

<span style="display: block; font-family: Calibri,sans-serif; text-align: center;"><The Most or the 2nd Most Important System In Our Body>

<span style="display: block; font-family: Calibri,sans-serif; text-align: left;">Muscle is a piece of body tissue that you contract and relax in order to move a particular part of a body. Our muscles work together, to make us move. There are around 600 separate muscles in our body. All of these muscles contract and relax. Muscles make 85% of our body weight.

<span style="display: block; font-family: Calibri,sans-serif; text-align: left;">There are 3 types of muscle tissues in our body. They are the skeletal, cardiac, and smooth muscles. Skeletal muscles are muscles that are connected at either or both ends to a bone and also move parts of the skeleton. These muscles move and support the skeleton. They are 50% of our weight. Smooth muscles are type of muscles found in hollow parts of our body, that are not under control. Cardiac muscles are muscle tissues of the heart. This muscle basically functions the heart.

<span style="display: block; font-family: Calibri,sans-serif; text-align: left;">Skin is the layer of tissue that covers our body. The skin has 3 different layers, which are also part of the skin. They are the epidermis, dermis, and the hypodermis. The epidermis is the most outer layer of our skin. It covers the entire body from head to toe. The middle layer is the dermis. This layer holds all blood vessels, nerves, hair follicles, collagen, and sweat glands. The last layer, or the inner layer is the hypodermis. This layer's main job is the temperature control. Fatty deposits and collagen helps us stay warm.

<span style="display: block; font-family: Calibri,sans-serif; text-align: left;">There are 2 types of muscles in our body; voluntary muscles and involuntary muscles. Voluntary muscles are muscles that we can decide when to move them. Involuntary muscles are muscles that works without us controlling it, or even being aware of it. These muscles are usually found in and around intestines, and around blood vessels. Voluntary and involuntary muscles are located in different parts of our body, but both are types of muscles.

<span style="display: block; font-family: Calibri,sans-serif; text-align: left;">Contracts and relaxes are movements of all muscles. When a muscle contracts, they pull, but can't push to produce the opposite movement. When a muscle relaxes, they lengthens. Again, the muscles never push, to reverse movements. The only movements the muscles make are contract or pull, and relax.

<span style="display: block; font-family: Calibri,sans-serif; text-align: left;">Muscles are different from fats and they actually help the body. If we only have bones, we wouldn't be able to stand, or even move. Or if we say it from the other side, we can say, if we don't have bones, we will just be a big bag of meat. This system is slightly different from others, and don't have a source, or an end. It just goes for ever, and ever, and never ends, unless we die.

<span style="display: block; font-family: Calibri,sans-serif; text-align: left;">By: Mizuki <span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left;"> Walter G5

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: center;">Amazing Human Muscular System

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> Muscular system is muscles in our body. There are three types of muscles. They are smooth muscles, cardiac muscles and skeletal muscles. Skin is a thing that covers our body. There are three types of layers in our skin. They are epidermis, dermis and hypodermis. I think if there were no muscles in our body, I think we will be skinny and not very strong.

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> Smooth muscles control the stomach. Smooth muscles are in your stomach. This muscle’s name is smooth muscles this doesn’t mean this muscle is smooth. This muscle helps us by like this, when we eat food, our food goes through our esophagus and that esophagus is smooth muscles. So it means this muscle help us by helping the food go through our esophagus.

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> Cardiac muscles help our hearts. Cardiac muscles are in your heart. Cardiac muscles help our heart pump and helps protect the heart. This muscle is important, because it helps us by protecting the heart and let the heart. If there were no cardiac muscles in our heart we would had a hard time living by now. This muscle has the most biggest job by protecting the heart.

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> Skeletal muscles help our bones move. Skeletal muscles are beside all the bones in our body. This muscle helps bones move by pulling the bones. Muscles cannot push the bones, muscles only can pull. Tendons are one type of skeletal muscles that combines muscles to bones. Ligaments are another type of skeletal muscles that combines bones to bones.

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> Skin is a like a protector for our body, because skin helps protect our bones and muscles or more. Epidermis is the first layer of the skin. Epidermis protects our body, so when we get hurt it is not that hurt. Dermis is the second layer of the skin. Dermis holds small blood streams. Hypodermis is the last layer of the skin. Hypodermis holds big blood streams.

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> In all these muscles cardiac muscles are the most important muscles, because it protects the heart. Muscles protect us and let us live very comfortably. The biggest muscle in our body is gluteus maximus. Gluteus maximus is our butt muscles. Muscles are important, because these all muscles protect our body. Don’t forget muscles and skin protects our whole body.

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> Let’s review. Smooth muscles are voluntary and they are in our stomach. Cardiac muscles are involuntary and they are in our heart. Skeletal muscles are voluntary and they are beside all the bones that are inside our body. Gluteus maximus are butt muscles and they protect our butt. Muscles only pull they never push. We have more than 600 muscles in our body. You need 17muscles to smile and 43 muscles to frown.

<span style="display: block; font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0cm 0cm 0pt; text-align: left; text-indent: 12pt;"> Skin is covered in our whole body. Epidermis is the first layer of the skin in our body and it protects our body. Dermis is the second layer of the skin in our body and it holds the small blood streams. Hypodermis is the last layer of the skin in our body and it holds the big blood streams.

The Muscular System-Yoshita G5

(The strongest muscle)

The Muscular system is made up of muscle tissues. The muscles are all over our body. It is one of the most important systems that everybody must have. If someone does not have this system, they will not be able to stand up. All muscles in the muscle system are like meat. There are 3 types of muscles. They each have really important jobs. They are the skeletal muscle, the smooth muscle, and cardiac muscle.

Skeletal muscles are muscles that are connected at either or both ends to a bone and also move parts of the skeleton. These muscles move and support the skeleton. They are 50% of our weight. Smooth muscles are type of muscles found in hollow parts of our body that are not under control. Cardiac muscles are muscle tissues of the heart. This muscle basically functions the heart.

There are 2 types of muscles in our body; voluntary muscles and involuntary muscles. Voluntary muscles are muscles that we can decide when to move them. Involuntary muscles are a muscle that works without us controlling it, or even being aware of it. These muscles are usually found in and around intestines, and around blood vessels. Voluntary and involuntary muscles are located in different parts of our body, but both are types of muscles.

Muscles are different from fats and they actually help the body. If we only have bones, we wouldn't be able to stand, or even move. Or if we say it from the other side, we can say, if we don't have bones, we will just be a big bag of meat. This system is slightly different from others, and don't have a source, or an end. It just goes for ever, and ever, and never ends, unless we die.

Skin is the layer of tissue that covers our body. The skin has 3 different layers, which are also part of the skin. They are the epidermis, dermis, and the hypodermis. The epidermis is the most outer layer of our skin. It covers the entire body from head to toe. The middle layer is the dermis. This layer holds all blood vessels, nerves, hair follicles, collagen, and sweat glands. The last layer, or the inner layer is the hypodermis. This layer's main job is the temperature control.

The longest muscle in our body is the sartorius muscle. It starts from hip and extands to the knee. One of the strongest muscles is the gluten maximum located in the buttocks. Jaw and the tongue muscles are also strong muscles. Whether we are playing games, reading, writing, talking or walking, some muscles are always working! The more muscles work, the stronger it becomes. This is why people who exercise have a far more muscle tone than people who don’t exercise.

Muscles are important because they help your body move. Three different muscles are skeletal muscles, smooth muscles, and cardiac muscles. These three muscles have different work to do. They need oxygen and food for energy to work. They usually join to the bones to make your body move. The masseters are the strongest muscles in your body. Muscles are covered by three layers of skin; Epidermis, Dermis, and Hypodermis.

The smooth muscle is found in the hollow parts of our body such as stomach, intestines, blood vessels and the bladder. The last one is the cardiac muscle. The heart is a muscle, and it is the cardiac muscle. Our heart beats nonstop 100,000 times each day. Heart only stops beating when you die. The cardiac muscle contracts automatically, and relaxes back.

<span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-align: center;">Muscular system

<span style="display: block; font-family: Calibri; font-size: 12pt; line-height: 115%; margin: 0cm 0cm 10pt; text-align: center;">The amazing three types of muscle

There are lots of muscles in the body. Muscle moves our body; they join into bones and pull the bones to make the body move. The muscular system is made up of tissues. Skeletal system control your movement of the body. Voluntary means you decide when to move them. Your stomach, heart, intestines and other organs are involuntary. This means that they are controlled automatically by the nervous system and hormone, you often don’t even realize at work. The body is made up of three types of muscle tissue, skeletal muscles, smooth muscles, and cardiac muscle. Each of these muscles has the ability to contract and expand, which allows the body to move. Tendons keep the muscles joined with the bone. There are more than 600 muscles in the human body. Most of the muscles work together in pairs. One muscle pulls while the other relaxes. You use 17 muscles to smile, but you use43 muscles to frown. Skeletal muscles are such as those in your arm. They only work when you think about making them work. The amount of work they do will depend on how active you are. Other muscles, such as your heart, the diaphragm works without you having to think about them. These automatically operating muscles are called involuntary muscles. They will work 24 hour with none stopping, they will not be tired and they are probably the most worked muscles. Skeletal muscles move and support the skeleton. They make up 50 percent of your body weight. There are 640 individually named skeletal muscles. A skeletal muscle links two bones across its connection joint. Those closest to the inside of the body are called deep muscles. These are muscles that we can consciously control. Muscles need oxygen and food for energy from your blood in order to work properly. If they work hard but do not get enough energy, they may go into a sprain and you feel the pain of a cramp. Smooth muscles are found in hollow parts of the body. The stomach, the bladder would be the places that are smooth muscles are be found. Smooth muscles are arrange in layers with fiber in each layer running in a different direction. Smooth muscles are an involuntary muscle. These muscles are under control of autonomic nervous system. This system controls many systems without us being aware of them. Cardiac muscles cells are striped, like skeletal muscle cell. Cardiac muscles contract automatically to squeeze the walls of the heart inward. Cardiac muscles are involuntary that means you can’t control it. The heart beats nonstop about 100,000 times each day. It can do this because cardiac muscle. Most of your heart is made of cardiac muscle. The cardiac muscle never gets tired and never stops beating until you die. written by: Pat G.5