Muscle contraction

What is the first step in initiating muscle contraction?

ACh release.

Which structure does the action potential reach during muscle contraction?

T-Tubule.

What is released from the sarcoplasmic reticulum (SR) during muscle contraction?

Calcium.

What are the initial steps in the contraction cycle?

Contraction cycle begins, active site exposure.

What occurs immediately after active site exposure in the contraction cycle?

Cross-bridge formation.

What happens during the pivoting of the myosin head?

Myosin head pivoting.

What is the final step of the cross-bridge cycle?

Cross-bridge detachment.

What reactivation occurs in myosin after contraction?

Myosin reactivation.

What is the first step in ending muscle contraction?

ACh is broken down at the NMJ.

What happens to calcium after muscle contraction ends?

SR reabsorbs calcium.

What occurs to the active sites after muscle relaxation?

Active sites covered.