Action Potential Through the Heart: Pacemaker Cells

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Join us in this video as we explore the inner workings of pacemaker cells and their crucial role in initiating the heart's action potential. We'll look at the Sinoatrial Node (SA node), where these cells reside, and witness their remarkable ability to generate action potentials. Discover the phases of an SA node action potential and explore different ion channels and the movement of ions in Phase 0 (depolarization), Phase 3 (repolarization), and Phase 4 (spontaneous depolarization). We'll also unravel the differences between pacemaker cells and contractile cardiac cells, shedding light on the diverse ion channels and their impact on the shape of the action potential. Prepare to be captivated by the electrifying wonders of the heart's rhythm.
00:17 - Pacemaker Cells
01:32 - Action Potential Graph in Pacemaker Cells
02:02 - Phase 4 (spontaneous depolarization)
03:28 - Phase 0 (depolarization)
04:01 - Phase 3 (repolarization)
04:33 - Action Potential Graph: Pacemaker vs Cardiomyocytes
05:54 - Comprehension Question