When a muscle contracts, it is:
a. responding to stimuli.
b. tightening
c. stretching.
d. relaxing.
b
FEEDBACK: a. Incorrect. Muscles can relax or contract in response to stimuli.
b. Correct. When a muscle contracts, it is tightening.
c. Incorrect. Stretching is a lengthening of the muscle, not a contraction.
d. Incorrect. Relaxing a muscle is the opposite of contracting.
Health Professions