Question

which statement correctly describes how smooth muscle is controlled?
a) controlled voluntarily by the autonomic nervous system
b) controlled voluntarily by the somatic nervous system
c) controlled involuntarily by the somatic nervous system
d) controlled involuntarily by the autonomic nervous system

Explanation:

Smooth muscle is part of the visceral muscle and is controlled involuntarily by the autonomic nervous system (which regulates involuntary functions like digestion, blood vessel dilation/constriction). Voluntary control is for skeletal muscle (somatic nervous system). So option d matches: controlled involuntarily by the autonomic nervous system.

Answer:

d) Controlled involuntarily by the autonomic nervous system