how do the cardiac cells get ready to generate another action potential?

use of ATP dependent Ca pump, the 3:1 sodium to calcium exchanger, and sodium potassium ATPase pumpm 3:2

atrial contraction forces a small amount of additional blood in relaxed vetnricles

atrial systole begins (very short compared with ventriclular systole

ventricular contraction pushes AV valve close but does not create enough pressure to open semilunar valves

first phase of ventricular systole begins

as ventricular pressure rises adn exceeds pressure in teh arteries, the semilunar valves open and blood is ejected

ventricular systole second phase

are responsible for arrhymias, are not self generating potentials but rely on preceeding action potentials. theyare flucuation in the membrane potentials that cause depolarization. they can occur before or after repolarization

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Stack #139647

Question	Answer
how do the cardiac cells get ready to generate another action potential?	use of ATP dependent Ca pump, the 3:1 sodium to calcium exchanger, and sodium potassium ATPase pumpm 3:2
the absolute refractory period (cannot respond) in cardiac muscle cells is _____while the relative refractory period (depends on stimulus) is _____	long/ short
long refractory period prevents	summation and tetany
the period between the start of 1 heart beat and the beginning of the next	cardiac cycle
atrial contraction forces a small amount of additional blood in relaxed vetnricles	atrial systole begins (very short compared with ventriclular systole
ventricular contraction pushes AV valve close but does not create enough pressure to open semilunar valves	first phase of ventricular systole begins
as ventricular pressure rises adn exceeds pressure in teh arteries, the semilunar valves open and blood is ejected	ventricular systole second phase
after potenials	are responsible for arrhymias, are not self generating potentials but rely on preceeding action potentials. theyare flucuation in the membrane potentials that cause depolarization. they can occur before or after repolarization

Created by: lainylaina

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