The most likely mechanism responsible for the patient’s arterial pulse rate of about 40 beats/ min..

The most likely mechanism responsible for the patient’s arterial pulse rate of about 40 beats/ min..

The most likely mechanism responsible for the patient’s arterial pulse rate of about 40 beats/ min after impulse conduction through the AV junction was blocked is: a. excitation of the ventricles via an AV bypass tract. b. conversion of ventricular myocardial fibers to automatic cells. c. firing of ventricular ectopic cells that have the same electrophysiological characteristics as SA node cells. d firing of automatic cells (Purkinje fibers) in the specialized conduction system of the ventricles. e. excitation of ventricular cells by the rhythmic activity in the autonomic neurons that innervate the heart.

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