The rate of heartbeat is determined by:
Correct answer: D. SA node
- A. Purkinje fibres
- B. Papillary muscles
- C. AV node
- D. SA node
Explanation
The sinoatrial node (SA) node, present in the upper posterior wall of the right atrium. It serves as a pacemaker as it is the rate of impulse generation is highest and determines the rate and rhythm of the heartbeat.
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