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Physiology

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Cardiovascular System

Question
8 out of 13
 

Which of the following is the correct order of activation after stimulation of Purkinje fibers:



A Endocardium, epicardium, upper most part of septum

B Endocardium, septum, epicardium

C Epicardium, endocardium; septum

D Epicardium, septum, endocardium

Ans. D Generates impulses at the highest rate

1. The various parts of the conduction system of heart and, under abnormal conditions, parts of the myocardium are capable of spontaneous discharge.

2. However, the SA node normally discharges most rapidly Q, depolarization spreading from it to the other regions before they discharge spontaneously.

3. The SA node is therefore the normal cardiac pacemaker, its rate of discharge determining the rate at which heart beats.

Cardiovascular System Flashcard List

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