Cardiac Muscle, Dr. D. Penney
- Fast - initial rapid inward Na+ current.
- - secondary outward K+ movement repolarization
- Slow* - Ca++ moves inward, responsible for maintained depolarization of the "plateau phase" (Phase 2)
* An increase in contraction frequency increases Ca++ movement inward, giving the "staircase" phenomenon (Treppe, Bowditch) in cardiac muscle.
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