Place the events involved in muscle contraction in the correct order.
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A nerve impulse causes ACh release at a neuromuscular junction.
1
Myosin heads attach to actin and form crossbridges.
4
Calcium ions are moved back into the sarcoplasmic reticulum by ATP-driven pumps.
6
Myofilaments passively return to their original state.
7
ACh binds receptors on the motor end plate, initiating a muscle impulse.
2
Calcium ions bind to troponin, causing tropomyosin to move and expose active sites.
3
A cyclic "attach, pivot, detach, return" event occurs.
5