Step I pacemaker AP relation to myocardial AP

[fiasco19]

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can someone explain how the two are related.

 

[jds112]

What exactly are you asking? You need the SA nodal AP to occur before the ventricular AP takes place.
Both have an efflux of K+ at phase 3/repolarization.

 

[fiasco19]

What exactly are you asking? You need the SA nodal AP to occur before the ventricular AP takes place.
Both have an efflux of K+ at phase 3/repolarization.

im not sure how to reword it. theres a pacemaker action potential in the heart; and a myocardial action potential. i get the differences but don't get how they relate. my guess is that when the pacemaker action potential occurs it causes the myocardial action potential to happen. but then the myocardial action potential has gap junctions so then the AV stall for filling wouldn't happen. I'm referring to FA 2015 pages 280 and 281.

 

[DrDreams]

Pacemaker potential fires. Spreads through atria, as it does the atria will contract. Ap arrives at the av node, slows down then spreads down bundle of his and then purkinjie fibers. Rv contracts slightly before lv.

The pacemaker cells are just specialized myocardial cells. Does this help?

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