Question

multiple choice question the contraction of smooth muscle is _____. involuntary voluntary automatic myogenic

Explanation:

Smooth muscle is not under conscious control. Voluntary muscles are those we can control like skeletal muscles. Automatic and myogenic are related to muscle - function mechanisms but not the main characteristic distinguishing smooth - muscle control. Involuntary means not under conscious will, which is true for smooth muscle.

Answer:

A. involuntary