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KIN 369 review Questions with Complete Correct Answers | Grade A+
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Automaticity Ans: the automatic nature of the heartbeat SA node Ans: is a pacemaker pacemaker potential Ans: slow spontaneous depolarization , between , hyped by hyperpolarization HCN Ans: HCN allow Na2+ to depolarize, (funny current) -40mV Ans: Voltage gated Ca2+ open, 2 - stimulate open Ca2+ , from SR Large Ca2+ COMES IN Ans: Contraction occurs ! Repolarization Ans: Occur with openin the K + CHANNELS Pacemaker action potential Ans: Starts at 40mV , goes to - 40MV by Ca2+ channel, pacemaker action potential Ans: *pacemaker cells in SA node depolarize spontanepusly Epi & nor epi / Ach increase rate of cardiac cells parasympathetic neuron (K+ does what) Ans: K+ slows the heart rate
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