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Electrical Conduction in Myocardial Cells

Electrical Conduction in Myocardial Cells . Figure 14-17. 1. 1. SA node. AV node. 2. 1. THE CONDUCTING SYSTEM OF THE HEART. SA node depolarizes. 2. Electrical activity goes rapidly to AV node via internodal pathways. SA node. 3. Internodal pathways. 3. Depolarization spreads

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CARDIAC ACTION POTENTIAL

CARDIAC ACTION POTENTIAL. P X = Permeability to ion X. P Na. 1. +20. 2. P K and P Ca. 0. -20. P K and P Ca. 3. 0. -40. Membrane potential (mV). P Na. -60. -80. 4. 4. -100. 0. 100. 200. 300. Time (msec). Phase. Membrane channels. 0. Na + channels open. 1.

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Electrical Conduction in Myocardial Cells

CARDIAC ACTION POTENTIAL