O-LevelBiologyCoordination & Response5090/11 · May/June 2023 · Q241 Mark
The diagram shows a reflex arc. A person was involved in an accident and their arm was injured. The sensory neurones at X were cut. Which statement describes what happens if this person touches a hot object with their finger?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThe person is not able to feel their finger touching the hot object but is able to move their finger away from the heat stimulus.
BThe person is not able to feel their finger touching the hot object or move their finger away from the heat stimulus.
CThe person can feel the heat stimulus but is not able to move their finger away from the heat stimulus.
DThe receptor cells in the person's finger are not stimulated by the heat.
✓ Correct answer
A: The person is not able to feel their finger touching the hot object but is able to move their finger away from the heat stimulus.
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