Muscular system

The muscular system is an organ system consisting of skeletal (involunatry muscles), smooth (voluntary muscles) and cardiac muscles. It permits movement of the body, maintains posture and circulates blood throughout the body. The muscular systems in vertebrates are controlled through the nervous system although some muscles (such as the cardiac muscle) can be completely autonomous. Together with the skeletal system in the human, it forms the musculoskeletal system, which is responsible for movement of the body.

Functions of muscles are as follows:

• It helps in the movement of the body.
• It helps in the circulation of a blood throughout the body.
• It helps in the digestions, respiration, and excretion of the body.
• It helps to give the proper shape to the body.
• It helps to store energy and produce heat to the body.
   

Types of muscles are:

1. Voluntary muscles
2. Involuntary muscles
3. Cardiac Muscles

In our body, there are many muscles but according to their structure and functions our muscles can be divided into three types, they are given below:

1. Voluntary muscles

Voluntary muscles are the muscles which normally exist in the outer part of the body and controlled by an individual according to their will. When we make a movement of a body part it also moves according to our movement. 

The muscles of legs, hands, arms, neck, belly etc move together with bones.The voluntary muscles are thick and stronger in the middles part and thin and weaker in the ends of the parts. Such types of muscles are striated and stiffer.

2. Involuntary Muscles

Involuntary muscles are the muscles which cannot be moved according to our will and cannot be seen by the eyes. We cannot be controlled the involuntary muscles by our will.

This types of muscles are softer and smooth then compared with voluntary muscles. The movement of the involuntary muscles is done by the nervous system of our body according to the requirement of a body, The muscles of kidney, digestive system, circulatory system etc have the involuntary muscles in our body.

3. Cardiac Muscles

Cardiac muscles are the muscles which are found only in the heart. These muscles are the involuntary muscles which are strong enough but are very flexible for extension and contraction.

Cardiac muscles pump the blood so in this process huge amount of energy is needed. It takes the energy of our body and controlled by the nerve impulse. It is the most important muscles in the human body because if it stops working then human being left to breathe and die.