Question

which trait do cardiac and smooth muscle share?

voluntary
involuntary
nonstriated
striated

Explanation:

Compare control mechanisms of muscle types

Cardiac muscle and smooth muscle are both controlled by the autonomic nervous system, meaning their contraction is not under conscious control. Therefore, they share the trait of being involuntary.

Analyze structural differences

Cardiac muscle is striated (having visible bands under a microscope), whereas smooth muscle is nonstriated (lacking these bands). Thus, they do not share structural traits like striation.

Answer:

• voluntary
• involuntary (Correct answer)
• nonstriated
• striated