Excitation-Contraction Coupling - Chapter 9 Lecture

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7 Terms

1
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Step 1 E-CC

Action potential is sent down Sarcolemma to T-tubules.

2
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Step 2 E-CC

Voltage sensitive proteins in T-tubules change shape from the voltage.

3
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Step 3 E-CC

Shape change opens Ca+ channels in Terminal Cisterns.

4
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Step 4 E-CC

Ca is released.

5
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Step 5 E-CC

Ca+ binds to Troponin, causing tropomyosin to move away from binding sites on actin.

6
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Step 6 E-CC

Causes a shape change removing tropomyosin from binding sites on actin.

7
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Step 7 E-CC

Contraction begins.