In a Relaxed Skeletal Muscle

Question

In a relaxed skeletal muscle
A) thick and thin filaments overlap to the greatest extent possible.
B) the Z lines are farthest apart.
C) calcium is bound to tropinin.
D) sarcomeres are at their shortest length.
E) calcium is released from the sarcoplasmic reticulum.

Accepted Answer

In a relaxed skeletal muscle, the Z lines are farthest apart. This is because the sarcomeres are at their longest length, with minimal overlap between thick and thin filaments. Calcium is not bound to troponin, nor is it released from the sarcoplasmic reticulum, in a relaxed muscle.