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Video Summary:
SA node is a normal pacemaker of the heart. Action potential in the SA node involves slow pacemaker potential due to slow entry of Na and Ca, upstroke due to rapid influx of Ca and Repolarization and hyperpolarization due to cessation of Ca entry and exit of K ions. Then the K efflux decreases and the slow entry of Na and Ca again brings the potential to a threshold to trigger the next action potential. Thus the SA node keeps generating action potential on its own.

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Chapters
00:00 Intro
00:19 Pacemakers in Heart
02:01 SA Node Intro
02:18 Ions Involved in Action Potential
03:06 Phase 4 of Action Potential
04:09 Phase 0 of Action Potential
04:21 Phase 3 of Action Potential
05:05 Next Action Potential
05:37 Heartbeat
06:10 Summary

Dr. Vipul Navadiya

DISCLAIMER: This video is for education purposes only. Although every effort is made to ensure the accuracy of the material, viewers should refer to the appropriate regulatory body/authorized websites, guidelines, and other suitable sources of information as deemed relevant and applicable. In view of the possibility of human error or changes in medical science, any person or organization involved in the preparation of this work accepts no responsibility for any errors or omissions, or results obtained from the use of information in this video.

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