Question

How much percent of the body's weight comes from its muscles?

Answer 1

Hint: Muscles are an important part of the human body system, it mainly supports the bone and helps in its movement. It also helps in the movement of various internal organs by contraction and relaxation.

Complete answer:
In the human body, muscles form $40-50\%$ of body weight. As it helps in various internal body functions and movement, it forms a major part of the human body system.
Muscles show properties like excitability, contractility, extensibility and elasticity. It is mainly divided into skeletal muscles, visceral muscles and cardiac muscles.
- The skeletal muscles have an attachment with the skeletal component of the body, which is under the control of will power. It is also known as striated muscles due to the presence of transverse stripes. It mainly performs locomotory actions and helps in changing the body postures.
-Visceral muscles are present inside the wall of internal organs, these muscles do not show stripes hence it is considered as smooth muscles. It is involuntary muscles and gets controlled by the nervous system of the body.
- Cardiac muscles show striation in the wall. These muscles present only in the heart of living organisms and it is involuntary. It is under the control of the nervous system and it works repeatedly without rest. In the nervous system, the autonomic nervous system controls the activity of the heart.

Note:
Mainly living organisms show three types of the movement known as amoeboid, ciliary and muscular. In animals, locomotion requires the coordinated activity of the muscles system, skeletal system and neural systems.