SA Node - Edubirdie

University:
Glendale Community College
Course:
BIO160 | Introduction to Human Anatomy and Physiology
Academic year:

2019
Views:

334

Pages:

2
Author:

liebre13pu

Physiology of the SA Node • SA node - no stable resting membrane potential • Pacemaker potential – gradual depolarization of SA cells from a slow inflow of Na+ into the SA cells – membrane potential rises from -60 mV to -40 mV • Action potential – occurs at threshold of -40 mV – depolarizing phase from -40 mV to 0 mV • Caused by opening of fast Ca+2 channels (lets Ca+2 in) – repolarizing phase • Caused by opening of K+ channels (let K+ out) • at -60 mV K+ channels close, pacemaker potential starts over • Each depolarization creates one heartbeat – SA node at rest fires every 0.8 sec or about 75 bpm at rest Membrane Potentials of SA Node Cells

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