Waec Model Questions Vol1 2022 Biology Question 25
Practice objective / multiple choice question 25 from the 2022 Waec Model Questions Vol1 Biology examination.
During a spinal reflex, the sensory neuron fires at a frequency of 120 impulses per second. Each impulse would normally release 5×10⁴ acetylcholine (ACh) molecules at the neuromuscular junction, but presynaptic inhibition reduces the release by 10%. The postsynaptic muscle fibre contains acetylcholinesterase that hydrolyses ACh at a rate of 2×10⁶ molecules per second. Assuming steady‑state conditions, what is the net accumulation of ACh molecules in the synaptic cleft per second?
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About This Question
This is Waec Model Questions Vol1 2022 Biology Question 25. It is a objective / multiple choice question from the 2022 Waec Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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