First slide

Circulatory Pathways

Question

Which of the following can generate maximum number of action potentials per minute?

Easy

A

SA Node
B

AV Node
C

Bundle of His
D

Purkinje fibres

Solution

The SAN can generate the maximum number of action potentials, i.e., 70-75 $\min^{- 1}$ , and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker.

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