Question

muscle functions
cardiac muscle is ____; smooth muscle is ____.
involuntary; involuntary
voluntary; voluntary
involuntary; voluntary
voluntary; involuntary

Explanation:

Cardiac muscle functions without conscious control, making it involuntary. Smooth muscle also operates without conscious thought, being involuntary as well. It lines internal organs and blood - vessels and functions automatically for processes like digestion and blood - vessel constriction.

Answer:

A. involuntary; involuntary