Stack #139647
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| 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
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| the absolute refractory period (cannot respond) in cardiac muscle cells is _____while the relative refractory period (depends on stimulus) is _____ | long/ short
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| long refractory period prevents | summation and tetany
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| the period between the start of 1 heart beat and the beginning of the next | cardiac cycle
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| atrial contraction forces a small amount of additional blood in relaxed vetnricles | atrial systole begins (very short compared with ventriclular systole
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| ventricular contraction pushes AV valve close but does not create enough pressure to open semilunar valves | first phase of ventricular systole begins
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| as ventricular pressure rises adn exceeds pressure in teh arteries, the semilunar valves open and blood is ejected | ventricular systole second phase
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| 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
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