Ch. 11 Steps of the excitation-contraction coupling phase

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4 Terms

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Step 1

A wave of action potentials spreads out from the neuromuscular junction and enters the T-tubules.

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Step 2

Action potentials in the T tubules lead to diffusion of calcium from the sarcoplasmic reticulum into the cytosol, where the thick and thin filaments are found.

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Step 3

Calcium binds to troponin of the thin filaments

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Step 4

The troponin-tropomyosin complex changes shape and exposes the active sites on the actin filaments.