GATE 2025 BM – Question 24

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

What is the approximate action-potential duration in a human ventricular muscle cell, in milliseconds?

2–3
200–300
2000–3000
20–30

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Show answer and explanation

Correct answer: (B) 200–300

Explanation

Ventricular action potentials have a prolonged plateau associated with calcium entry, extending their duration to a few hundred milliseconds. The source range is two hundred to three hundred milliseconds, B, much longer than a typical brief neuronal spike.

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