False Cardiac autorythmic cells do not have a resting potential. True False Pace

Question

False Cardiac autorythmic cells do not have a resting potential. True False Pacemaker activity is defined by membrane potential slowly depolarizing between action potentials until threshold is reached. This depolarization is a result of a. passive ion movement across the membrane between AP's. pressure gradients across the membrane between AP's K + influx into the cardiac cells Which answer choice best defines cells that develop from the Agranular Leukocytes Symphocyte? B-cells T-cells B and T cells Systole is defined by Contraction and filing Contraction and relaxation Contraction and emptying Because the ventricular mass is much larger than the atrial mass, the ventricular conduction system is much because an impulse has to move throughout a larger tissue ma before contraction can proceed. Faster Slower AP speed doesn't change When considering heart conductivity, which of these will become the pace maker of the hear the original pacemaker is compromised? SA node Av node Bundie of His If the answer to #37 also becomes compromised, which of these will become the pacemaker SA node AV node Bundle of His

Explanation / Answer

34) Cardiac autorhythmic cells are the pacemaker cells present in the sinuatrial (SA) node of the cardiac muscle. These cells have no true resting potential but generate regular spontaneous action potential called as pacemaker potential. The depolarizing current is carried into the autorhythmic pacemaker cells primarily by relatively slow Calcium channels. The firing of the pacemaker cells is induced electrically by reaching the threshold potential of the cell membrane. So, the answer for this question is option (a) true.

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