When a skeletal muscle is fully contracted, the ________ are closer to the thick filaments.
A) Z discs
B) M lines
C) cross bridges
D) A bands

Question

Quizplus · Accepted Answer

When a skeletal muscle is fully contracted, the thin filaments (attached to the Z discs) slide towards the center of the sarcomere towards the thick filaments (located in the middle of the sarcomere between the Z discs). This sliding action causes the Z discs to move closer together, resulting in a shorter sarcomere and ultimately a contracted muscle. Therefore, the correct choice is A) Z discs.

When a Skeletal Muscle Is Fully Contracted, the ________ Are