ExpertMedium1 markMultiple Choice
AQA GCSE · Question 02.2.3 · Homeostasis and Response
Which part of the nerve pathway is labelled C?
Which part of the nerve pathway is labelled C?
Answer options:
A.
Motor neurone
B.
Receptor
C.
Relay neurone
D.
Spinal cord
How to approach this question
Identify the central part of the reflex pathway, labelled C. This is part of the Central Nervous System (CNS) where the sensory information is processed and a response is initiated. In a simple reflex arc like this, this processing happens in the spinal cord, not the brain.
Full Answer
D.Spinal cord✓ Correct
Spinal cord
The reflex arc pathway is: Stimulus → Receptor → Sensory Neurone → Relay Neurone (in CNS) → Motor Neurone → Effector → Response. Part C represents the location within the Central Nervous System where the sensory neurone passes the impulse to the motor neurone (usually via a relay neurone). For reflexes that don't involve conscious thought, this occurs in the spinal cord.
Common mistakes
✗ Choosing "Relay neurone". The relay neurone is a cell *within* the spinal cord, but C points to the entire structure.
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