Question

1. which of the following statements accurately describes smooth musc

a. it is striated and contracts involuntarily in response to nervous system signals.
b. it is non - striated and contracts involuntarily in peristaltic waves.
c. it is non - striated and contracts voluntarily in response to nervous system signals.
d. it is striated and contracts voluntarily in peristaitic waves.

Explanation:

To determine the correct statement about smooth muscle, we analyze each option:

• Option a: Smooth muscle is non - striated, so the "striated" part is wrong.
• Option b: Smooth muscle has no striations (non - striated), and it contracts involuntarily. Peristaltic waves are a type of involuntary contraction that smooth muscle (like in the digestive tract) undergoes.
• Option c: Smooth muscle contraction is involuntary, not voluntary, so this is incorrect.
• Option d: Smooth muscle is non - striated and contraction is involuntary, so both "striated" and "voluntarily" are wrong.

Answer:

b. It is non - striated and contracts involuntarily in peristaltic waves.