Question

Name the voluntary muscles from the following.
a. Smooth muscle
b. Cardiac muscle
c. Both A and D
d. Striated muscle

Answer 1

Hint: The muscles present in limbs such as arms and legs are called striated muscles. The bundles of the muscle tissues are arranged and surrounded by connective tissues. The cells present are multinucleated due to the fusion of many myoblasts.

Complete answer:
Striated muscles are also known as skeletal muscles or voluntary muscles. These muscles come under the control of the body’s nervous system.

Properties of striated muscles
Extensibility – This is the feature of the muscles in which they can extend themselves when stretched.
Elasticity – The muscle can return to its original form when it is released.
Excitability – This is the property of the muscle which helps in responding to the stimulus.
Contractibility – In this muscle can able to contract itself when comes in contact with a stimulus.

Functions of striated muscles
- There are various functions of striated muscles which are discussed below:
- The striated muscles help in body movements like typing, breathing, writing, arm extending, etc. When the tendons on the bones pull by contraction of muscles then movement takes place.
- It helps in maintaining body posture. The erect posture of the body is maintained by gluteal muscle.
- The internal organs and tissues are protected and supported by the striated muscles from any injury.
- The entry and exit point of the body is supported by the striated muscle. Sphincter muscles are present around the anus, mouth, and urinary tract that helps in openings and reduce the size by muscle contraction.
- The body temperature is regulated by striated muscles. After heavy exercises, our body feels hot and this is due to striated muscle contraction that converts energy into heat.

So, the correct answer is D, Striated muscle

NOTE: Sarcomeres are present in the striated muscles that manifest a series of bands visible along the muscle fibers. These are repeating functional units of the striated muscle tissue. These also help in observing the microscopic image of the tissue.