muscle contraction step 4

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Description and Tags

excitation-contraction coupling

6 Terms

1
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step 6

action potentials travel down T tubules (via voltage gated channels)

2
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step 7

calcium released, voltage change opens calcium channels in SR

3
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step 8

calcium binds to troponin

4
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step 9

shifting of tropomyosin; exposure of active sites on actin (tropomyosin moves out of way)

5
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cross bridge

connection between action + myosin

6
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when do cross bridges form?

in the presence of calcium