All Skeletal Muscle Fibers are Both

Question

All skeletal muscle fibers are both
A) smooth and under involuntary control.
B) smooth and operate independently of other skeletal muscle fibers.
C) striated and under voluntary control.
D) smooth and under voluntary control.
E) striated and electrically coupled to neighboring fibers.

Accepted Answer

Skeletal muscle fibers are striated, meaning they have a striped appearance due to the arrangement of protein fibers. They are also under voluntary control, meaning we can consciously choose to contract or relax them. Option A is incorrect because smooth muscle fibers are found in organs like the digestive system and are under involuntary control. Option B is incorrect because skeletal muscle fibers are interconnected and work together to generate movement. Option D is incorrect because smooth muscle fibers are under involuntary control. Option E is incorrect because while skeletal muscle fibers are electrically excitable, they are not electrically coupled to each other.