38) This is the correct path of an electrical excitation from the pacemaker to a

Question

38) This is the correct path of an electrical excitation from the pacemaker to a cardiocyte in the atrioventricular (AV) node- left ventricle. sinoatrial (SA) node >atrioventricular (AV) bundle Purkinje fibers-cardiocyte in LV atrioventricular (AV) node >Purkinje fibers + atrioventricular (AV) bundle sinoatrial (SA) node-cardiocyte in LV C. atrioventricular (AV) node > sinoatrial (SA) node atrioventricular (AV) bundle- Purkinje fibers-+ cardiocyte in LV sinoatrial (SA) node - atrioventricular (AV) node - atrioventricular (AV) bundle - Purkinje fibers-cardiocyte in LV 39) Cells of the sinoatrial node during the pacemaker potential. A. depolarize fast B. depolarize slow C. repolarize slow D. repolarize fast 40) Atrial depolarization begins during A. the P wave. B. the QRS complex. C. the T wave. D. the first heart sound. 41) The long absolute refractory period A. ensures a short twitch. B. prevents tetanus. C. makes the heart prone to arrhythmias. D. prevents the occurrence of ectopic focuses. 42) Cardiac muscle can only use glucose as a source of organic fuel. (True or False) 43) During isovolumetric contraction, the pressure in the ventricles A. falls rapidly B. rises rapidly C. remains constant. D. rises and then falls. 44) The papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the AV valve flaps. (True or False)

Explanation / Answer

38) D

39)B

40)A

41)B

42) false

43)B

44)false

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