Which of the statements about muscle contraction is correct?
A)During muscle contraction the sarcomere becomes shorter.
B)During muscle contraction the I band becomes shorter.
C)During muscle contraction the H zone becomes shorter.
D)During muscle contraction the distance between the Z disk and the M disk becomes shorter.
E)All of the answers above are correct.

Question

Quizplus · Accepted Answer

All of the statements are correct. During muscle contraction, the sarcomere (the basic unit of muscle contraction) becomes shorter, causing both the I band (the light band) and the H zone (the area in the center of the A band where there is no overlap between thick and thin filaments) to become shorter. The distance between the Z disk (the boundary between each sarcomere) and the M disk (the mid-point of the A band where the thick filaments are anchored) also becomes shorter.

Which of the Statements About Muscle Contraction Is Correct