Question

Which muscles acts involuntarily?

• A. A and B
• B. B and C
• C. C and D
• D. A and D

Answer 1

The correct option is B

B and C

The correct option is B:

1. Involuntary muscles are those muscles which cannot be controlled by our will.
2. Smooth muscles and cardiac muscles come under involuntary muscles.
3. Smooth muscles are unstriated muscle fibers which occurs in the walls of visceral organs(except heart).
4. They contracts rhythmically and hence can be observed in digestive urinary and reproductive system.
5. Cardiac muscles are only found in heart. They relaxes and contracts rapidly and rhythmically.
6. Skeletal muscles or striated muscles are voluntary muscles which work according to our will.

Thus, smooth muscles and cardiac muscles acts involuntarily.