Place the following steps in the sliding filament theory of muscle cell contraction in the correct order:
Place the following steps in the sliding filament theory of muscle cell contraction in the correct order:
1 - B. Depolarization
2 - C. Repolarization
3 - Na+ ion channels open, and Na+ rushes into the cell
4 - CA++ binds to troponin and tropomyosin, and removes them from the binding sites on actin
5 - A. The neurotransmitter is released into the synaptic cleft, diffuses to the sarcolemma, and binds to receptors
6 - b. the sarcomeres shorten, shortening the muscle cell
7 - Troponin and tropomyosin cover the actin binding sites again
8 - Ca++ is released into the cell from sarcoplasmic reticulum and T-tubules
9 - Ca++ is returned to the T-tubules and sarcolemma, using ATP
10 - The muscle cell is ready to contract again
11 - c. ATP releases each myosin head from the actin binding site , which attaches to the next actin binding site
12 - Na+ channels close, and K+ channels opening, allowing K+ to rush out of the cell
13 - The Na+/K+ pump restores the resting potential across the membrane using ATP
14 - Steps a through c are repeated
15 - The sarcomeres relax (and lengthen); the muscle cells relax
16 - a. MYosin heads bind to the actin, change shape, and pull the actin filaments inwards
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