Heart muscle AP, ECC and Tension

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This video tutorial reviews the relationship between AP, ECC and Muscle tension:
0:00. Introduction
0:33. Anatomy of the graph
1:59. 1. AP propagates along membrane, down T-Tubule and activates L-type Calcium channel
2:14. 2. Ca flows into cell and binds to and activates the RyR receptor
2:25. 3. SR releases loads of Ca into the cytoplasm
2:31. 4. Rise in cytoplasmic Ca activates the myosin and actin to contract
2:42. Cytoplasmic Ca must decline for cell to relax (SERCA)
2:52. This is a very sequential process ...
3:43. In-A-Nutshell and Acknowledgements