An example of a partial but sustained contraction of a whole muscle is
A) eye blinking.
B) tetanic contraction of a muscle fiber.
C) a twitch.
D) muscle tone.
E) fatigue of a motor unit.

Question

Quizplus · Accepted Answer

Muscle tone is the partial but sustained contraction of a whole muscle to maintain its readiness for action. It is distinct from a twitch, which is a brief, sudden contraction of a muscle fiber, and tetanic contraction, which is a sustained contraction caused by repeated stimuli. Eye blinking is a reflex action and not a sustained contraction of a whole muscle, while fatigue of a motor unit refers to the inability of a motor unit to contract after prolonged activity.

An Example of a Partial but Sustained Contraction of a Whole