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Straited/Skeletal Muscles

Which of the ...

Question

Which of the following heart tissues is known as the pacemaker?

A

AV node

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B

SA node

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C

Bundle of His

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D

Purkinje fibres

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Solution

The correct option is B
SA node

Cardiac impulses originate from the sino-atrial node (SA node) and are passed on to the bundle of His by the atrio-ventricular node. Thus, the SA node initiates and maintains the rhythmicity of the heart. Hence, it is known as the pacemaker.

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Straited/Skeletal Muscles

Standard IX Biology

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