Biology Nervous Coordination SZABMU 2023
PMDC Verified Question 43 of 86
What is the fate of neurotransmitters after provoking impulse in postsynaptic membrane?
A
Stay in synaptic cleft indefinitely
B
Recycled in synaptic cleft
C
Degraded by enzyme
D
Taken up by postsynaptic membrane
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Degraded by enzyme
Concept:

For clear and precise neural signaling, the synaptic cleft must be rapidly cleared of neurotransmitters once the message is delivered.

Solution:

  • To prevent continuous, paralyzing over-stimulation, neurotransmitters are swiftly removed. While some undergo presynaptic reuptake, a primary and definitive fate (especially for Acetylcholine) is being rapidly degraded by specific enzymes (like acetylcholinesterase) directly in the cleft.


Why other options are incorrect:

  • Stay indefinitely: This would cause lethal tetanic spasms or complete desensitization.


  • Taken up by postsynaptic: Reuptake strictly occurs into the presynaptic neuron, not postsynaptic.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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