ExpertMedium1 markMultiple Choice
AQA GCSE · Question 02.2.1 · Homeostasis and Response
Figure 3 shows the nerve pathway for a reflex action. The arrows show the direction of the nerve impulse.
Which part of the nerve pathway is labelled A?
Figure 3 shows the nerve pathway for a reflex action. The arrows show the direction of the nerve impulse.
Which part of the nerve pathway is labelled A?
Answer options:
A.
Motor neurone
B.
Receptor
C.
Relay neurone
D.
Spinal cord
How to approach this question
Trace the path of the nerve impulse, starting from the stimulus. The impulse begins at the point where the change is detected. This first part of the pathway is labelled A. Identify the name for the cell/organ that detects a stimulus.
Full Answer
B.Receptor✓ Correct
Receptor
The reflex arc pathway is: Stimulus → Receptor → Sensory Neurone → Relay Neurone (in CNS) → Motor Neurone → Effector → Response. Part A is at the beginning of the pathway where the stimulus is detected (e.g., in the skin). This is the receptor.
Common mistakes
✗ Confusing the different types of neurones.
✗ Misinterpreting the direction of the nerve impulse shown by the arrows.
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