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The muscular system plays several roles in the human body. It is essential for locomotion, balance and posture, absorbing shock and heat, breathing, and digesting food. These are just a few of the important functions that are performed by the muscular system, there are many more. If our bodies did not have muscles, we would not be able to move or even breathe and our hearts would not be able to circulate blood throughout the body. For all of these reasons, the muscular system is vital.
There are three types of muscles. Cardiac muscles are found in the heart. Smooth muscles (involuntary) are controlled by the autonomic nervous system. Skeletal muscles are attached to bones and allow us to move.
Without the muscular system we wouldn't be able to move, at all. We would be no different than a plastic skeleton hanging up in a biology class that is covered in a layer of dermis. Furthermore, all the major organs in our bodies like our heart and stomach are also muscles, without them we wouldn't be able to survive in the capacity that we do now at all. Our muscular system functions to give us mobility, produce heat, absorb the shock of our falls, create a shape to our body, respirate, swallow and digest our food, and pump blood through our bodies. Without it, we would not survive as an organic being.
There is no particular main structure of the muscular system though the one that often first comes to mind is our skeletal muscles - the muscles that give us mobility and strength. They are our voluntary muscles. After that people usually thinking of our cardiac muscles that circulate blood through out bodies, and finally the smooth muscles that make up our internal organs like our stomach, throat, intestines etc. Both the cardiac and smooth muscles are involuntary, we do not consciously choose to make them go, but instead they go on autonomically.
One of the chief functions of the muscular system is the production of heat. This is important for the maintenance of homeostasis (maintaining a stable consistent internal environment). Body temperature must remain within an acceptable range or face adverse physiological consequences. Muscle fibers generate heat by sliding against one another in the sliding filament theory/model.
Of course, another apparent function is movement. Skeletal muscles attach to the skeleton. When we move our bodies muscles with the assistance of tendons and ligaments help pull the bones in the direction we want to move. Additionally, the heart is composed of muscle and without a functioning heart everything else is fruitless.
Muscle tissue also stores needed energy in the form of glycogen, this is a reserve energy source that the body utilizes when called upon.
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Muscular system in human body moves the body and enables many body organs to perform their functions. Without muscles the body will not be able to carry out most of its normal processes such as circulation of blood, breathing, and digesting the food. Also the body will not be able to move. In this way a person cannot continue to live without the contribution of muscular system in functioning of his or her body.
The muscular system in human body consists of more than 600 muscles. There is no common agreement on exact number of muscles in human body as some of the muscles are grouped by different scholars and experts in different ways. Each of the muscle consists to groups of fibres that are capable of contracting to exert the force required for movement and for exerting force. When a muscle contracts it pulls the parts of the body to which it is attached causing it to move.
Muscles of human body are divided in two main groups called skeletal muscles and smooth muscles. In addition a third kind of muscle group called cardiac muscles is present only in heart, and has characteristics of both skeletal and smooth muscles.
Skeletal muscles are attached to the bones of the skeleton and are responsible for moving various bones of the skeleton including parts such as fingers, arms and legs. We are able to consciously control the movement of skeletal muscles.
Smooth muscles are found in most of the body's internal organs that are responsible for giving required movement to the organs for their functioning. For example smooth muscles in the walls of the stomach and intestines move food through the digestive system. Similarly smooth muscles also control the width of the blood vessels and the size of the breathing passages. Smooth muscles function by contracting and relaxing involuntarily. We do not make conscious effort to make these muscles work. Therefore the smooth muscles are also called involuntary muscles.
It is important to note that in the process of moving various part of the body the muscles do consume energy and produce heat, but that is not a direct function of muscles.
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