Biology Nervous Coordination MDCAT 2019
PMDC Verified Question 73 of 86
The reflex action is the phenomena which only involves:
A
Brain, receptors, spinal cord
B
Receptors, neurons, brain
C
Receptors, effectors and spinal cord
D
Receptors and effectors
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Receptors, effectors and spinal cord
Concept:

A spinal reflex arc is an involuntary, rapid response mechanism that bypasses conscious thought to protect the body.

Solution:

  • A standard spinal reflex relies purely on the peripheral and spinal pathways: it detects a stimulus (receptors), processes it at the level of the spinal cord via an interneuron, and immediately triggers a response via effectors. The brain is not actively involved in the reflex execution itself.


Why other options are incorrect:

  • Options involving the Brain represent conscious pathways or cranial reflexes, not the standard localized spinal reflex action meant by this specific curriculum question.

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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