Biology Nervous Coordination NUMS 2024
PMDC Verified Question 24 of 86
What is the fate of our neurotransmitter after the transmission of nerve impulse across synapse?
A
Remains bound to post synaptic membrane
B
It is taken into post synaptic neuron
C
Broken down by enzyme
D
Remains stray in the synaptic cleft
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Broken down by enzyme
Concept:

Synapses must be "reset" almost instantly to allow the processing of new, incoming signals.

Solution:

  • To terminate the signal and prevent continuous, paralyzing stimulation of the postsynaptic cell, the neurotransmitter is swiftly removed from the cleft. A primary biological mechanism for this (classically seen with Acetylcholine) is being broken down by specific enzymes (e.g., acetylcholinesterase) directly in the synaptic cleft.


Why other options are incorrect:

  • Remains bound / stray: This would cause permanent activation and muscle tetanus/spasms.


  • Taken into post synaptic neuron: Reuptake mechanisms pull the transmitter back into the presynaptic neuron, never the postsynaptic one.

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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