Cardiac muscle differs from skeletal muscle in that
A) all cardiac muscle is under involuntary control.
B) cardiac muscle is capable of relaxation.
C) cardiac muscle contracts in response to an electrical or chemical signal.
D) cardiac muscle is excitable and can shorten.
E) cardiac muscle gets longer rather than shorter when excited.

Question

Quizplus · Accepted Answer

Cardiac muscle is under involuntary control, unlike skeletal muscle which is under voluntary control. Other options are characteristics shared by both cardiac and skeletal muscles.

Cardiac Muscle Differs from Skeletal Muscle in That