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1. Action potential carried into the interior of the cell via T-tubules 2. Calcium enters the cell
through L type receptors 3. Calcium binds to calcium release channels on junctional
sarcoplasmic reticulum 4. Release of calcium from junctional sarcoplasmic reticulum 5.
intracellular calcium binds to the regulatory protein troponin, leading to cross-bridge formation
6. At the end of a cardiac action potential SR Calcium-ATPase pumps in the network SR actively
pump calcium back into the SR , and the sarcoplasmic sodium-calcium exchanger ejects calcium
from the cell

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