Which of the following events does not occur during muscle contraction?
A) The distance between Z lines increases.
B) The sarcomere shortens.
C) The H zone is reduced.
D) The I band is reduced.
E) The area of actin and myosin overlap increases.

Question

Quizplus · Accepted Answer

During muscle contraction, the distance between Z lines decreases, as the sarcomere shortens due to the sliding of actin and myosin filaments. The H zone (the region in the center of the sarcomere containing only myosin) also reduces, and the I band (the region containing only actin) reduces as well. The area of actin and myosin overlap increases as the myosin heads bind to the actin molecules and pull them towards the center of the sarcomere. Therefore, the only event that does not occur during muscle contraction is the increase in the distance between Z lines.

Which of the Following Events Does Not Occur During Muscle