NEET Zoology Nervous System Structure MCQ Question
If a synaptic cleft in the human neural system measures 20 nm across, and the speed of neurotransmitter diffusion is approximately 0.5 mm/s, how much time (in microseconds) does it take for a neurotransmitter to diffuse across the cleft?
40 μs
20 μs
10 μs
5 μs
Correct Answer
Detailed Explanation
Given the synaptic cleft width of 20 nm (0.02 μm) and diffusion speed of 0.5 mm/s (500 μm/s), time = distance/speed = 0.02 μm / 500 μm/s = 0.00004 s = 40 μs. Hence, 10 μs is incorrect, correct calculation indicates 40 μs.
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