Place the Following Steps in Order to Describe the Process

Place the following steps in order to describe the process by which a muscle contraction occurs (1 to 8).
_____ 1. Calcium binds to troponin.
_____ 2. Adenosine triphosphate (ATP) molecules bind to the myosin head, detaching it from the actin, and the crossbridge is broken.
_____ 3. The motor neuron receives an action potential and stimulates neurotransmitter release (acetylcholine [ACh]).
_____ 4. Troponin changes shape, and tropomyosin shifts to expose binding sites of actin.
_____ 5. ACh binds to receptors on the motor end plate, which creates an action potential.
_____ 6. Calcium is released from the sarcoplasmic reticulum.
_____ 7. Adenosine diphosphate (ADP) is released and the myosin head pivots, pulling the actin toward the center; the muscle is contracting.
_____ 8. During the crossbridge cycle, ATP binds to myosin and activates it. The activated myosin head binds to actin, creating a crossbridge.