GATE 2024 BM – Question 14

Mammalian Cell Biology, Human Anatomy and Physiology · Circulatory System · 1 mark · Multiple choice

Normal rhythm in a healthy human heart originates from which structure?

Sinoatrial node
Atrioventricular node
Aorta
Right atria

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Show answer and explanation

Correct answer: (A) Sinoatrial node

Explanation

The sinoatrial node contains the dominant pacemaker cells that initiate the normal heartbeat. The AV node primarily delays and relays conduction, while aorta is a vessel. The SA node lies in the right atrium, but the specific pacemaker structure is A.

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