Which structure conducts the electrical impulse from the atria into the ventricles quizlet?
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Terms in this set (31)Internodal pathways Link(s) between the SA node and AV node AV node Delay(s) occurs here while atria contract Bundle branches Convey(s) the impulse down the interventricular septum SA node Set(s) the pace for entire heart AV bundle Electrical link(s) between atria and ventricles Purkinje fibers Convey(s) the impulse throughout the ventricular walls SA node Which part of the intrinsic conduction system normally initiates the depolarizing impulse that causes a heartbeat? AV node Which of these structures conduct(s) action potentials the slowest? Purkinje fibers initiate spontaneous action potentials, which cause the ventricles to contract early. A person notices his or her heart beat because he or she senses blood being pumped by the heart. Excessive caffeine intake can lead to irregular heart rhythms (arrhythmias) that patients perceive as "skipped beats." Given that caffeine is a stimulant, which of the following mechanisms best explains the reason for the feeling that the heart skipped a beat? So blood is forced upward, toward the semilunar valves The anatomy of the intrinsic conduction system causes contraction of the ventricles to begin at the apex and move superiorly. Why is this important? Ca2+ influx The plateau phase of the cardiac action potential is due to? SA node Which part of the conduction system initiates the depolarizing impulse, which spreads throughout the heart? Electrical activity in the heart What does the ECG wave tracing represent? Ventricular depolarization What does the QRS complex represent in the ECG wave tracing? P wave Contraction of the atria results from which wave of depolarization on the ECG tracing? AV node Which part of the intrinsic conduction system delays the impulse briefly before it moves on to the ventricles? Involve calcium voltage-gated channels Unlike skeletal muscle action potentials, cardiac muscle action potentials? The atria contract Which of the following happens immediately after the P wave? Pacemaker cells The cells that rhythmically and spontaneously generate action potentials in the heart are called? Gap junctions Action potentials generated by the autorhythmic cells spread to the contractile cells through what structures in the membrane? Potassium One of the changes that occurs in the pacemaker potential (unstable resting membrane potential) in the SA node (an autorhythmic cell) is a decreased efflux of what ion? Fast calcium When threshold is reached at the SA node (an autorhythmic cell), what channels open causing further depolarization of the membrane? Voltage-gated potassium channels Repolarization of an autorhythmic cell is due to the opening of which channels? The flow of positive ions from adjacent cells In order to cause cardiac muscle contraction, the contractile cells must also depolarize. What causes the depolarization of the contractile cells? Ventricular repolarization The T wave of an ECG corresponds to? delayed; before The electrical impulse is __________ as it passes through the AV node, because the atria need to contract __________ ventricles. SA node The main pacemaker of the heart is the? Isovolumetric contraction Ventricular systole begins during the __________ phase of the cardiac cycle. End-diastolic volume The maximum amount of blood in the ventricles at the end of the ventricular filling phase is called? Pressure in the left ventricle falls below aortic pressure The aortic valve closes when? Pressure in the ventricles increases The AV valves close when? Sets with similar termsphysiology ch. 1450 terms s_blake aandp ch24 pt122 terms Sapphirebaaby Ch. 20 - Cardiovascular System: The Heart158 terms Jamiesfal A&P Mylab and Mastering Ch. 17104 terms karly_branch2 Sets found in the same folderA&P chapter 1823 terms dgb1621 Mastering A&P HW CH 1849 terms pngu4 Chapter 19 Homework51 terms Larissa_Elman Unit 397 terms hhiggins91 Other sets by this creatorMuscle innervations132 terms lkhenry9 NATA Position Statements65 terms lkhenry9 Elbow53 terms lkhenry9 Cervical Spine Exam20 terms lkhenry9 Verified questions
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What structure sends the electrical impulse to stimulate the atria to contract quizlet?As blood collects in the upper chambers (the right and left atria), the heart's natural pacemaker (the SA node) sends out an electrical signal that causes the atria to contract.
What structure passes the action potential from the the atria to the ventricles?The AV node is the gatekeeper that sends the action potential from the atria to the ventricles. The AV node also slows down the conduction velocity to allow time for the atria to contract before depolarizing the ventricles.
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