Review Note

Last Update: 01/14/2024 12:31 PM

Current Deck: ✪ YEAR 1::★ 2nd Bimonthly::✦ Exam #5: Anatomy of the Heart, Cardiac Skeleton, and Conduction System; Cardiac Electrophysiology and the Electrocardiogram::♠ Buddycards: Mod 7 Part 1 and Tasks 1 - 5::🏃 Javier ✪ AM

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Front
If the SAN fails to generate AP, which of the following occurs?
1. The AVN becomes the pacemaker
2. The atria will not be depolarized
3. The heart rate will be lower than 60 bpm
4. The purkinje fibers will be spontaneously depolarized
Back
1. The AVN becomes the pacemaker
3. The heart rate will be lower than 60 bpm

Rationale:
AVN becomes the pacemaker as it has also autorhythmicity properties just like the SAN but is slower. AV nodal fibers discharge an intrinsic rhythmical rate of 40-60 beats per minute.

In diseased states, if SAN cannot generate action potential the AVN will generate instead the action potential in its normal rate (no delay) 

AVN becomes the pacemaker as it also has auto rhythmicity.

AV rhythmical rate is 40-60bpm

Tags:

Physiology

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