Which of the following can actually shorten during a muscle contraction?
A) myosin filament
B) A band
C) actin filament
D) sarcomere
E) myofilament

Question

Quizplus · Accepted Answer

During muscle contraction, the sarcomere, which is the basic unit of muscle contraction, shortens. This is due to the overlapping of actin and myosin filaments within the sarcomere, which causes the overall length of the sarcomere to decrease. Therefore, choice D, sarcomere, is the correct answer. The other choices are incorrect because they do not shorten during muscle contraction.

Which of the Following Can Actually Shorten During a Muscle