Which of the following changes take place as the muscle contracts?
A)The Z lines get closer together.
B)The H zones get smaller.
C)The I band gets smaller.
D)The A band gets smaller.
E)choices A, B, and C

Question

Quizplus · Accepted Answer

During muscle contraction, the sarcomere shortens, causing the Z lines to move closer together, the H zone (which contains only myosin filaments) to get smaller, and the I band (which contains only actin filaments) to get smaller. Therefore, all three choices A, B, and C are correct. However, the A band (which contains overlapping myosin and actin filaments) does not change in size during contraction, so choice D is incorrect.

Which of the Following Changes Take Place as the Muscle