The action potential is propagated over the surface of sarcolemma and down T-tubules.
- once initiated, the action potential is unstoppable, and ultimately results in the contraction of a muscle
Calcium binds to troponin-C; troponin-C changes shape.
ATP is hydrolized to ADP and Pi, energizing myosin head to cocked position needed for next sequence.
The cycle is repeated again and again during contraction as long as calcium and ATP is available.
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