Question

Which of the following muscles act involuntarily?

(i) Smooth muscles
(ii) Cardiac muscles
(iii) Skeletal muslces

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (i)
• D. (i), (ii) and (iii)

Answer 1

Answer: (A)

(i) and (ii)

Smooth muscles are located in visceral organs of the body. For example, urinary bladder, uterus, respiratory tract, etc. They are involuntary muscles. Similarly, Cardiac muscles are present in heart and help in rhythmic contraction and relaxation of auricles and ventricles. This movement of the heart cannot be controlled by the human body, thus are termed as involuntary movements.

In contrast, skeletal muscles are attached to bones which function in bodily movements like, walking, running, etc. These are voluntary movements since they are in direct control of an individual.

Hence the correct option is A.