Which accurately reflects the path of information flow that takes place when child jerks his hand away from a hot pan?
A) Spinal interneurons $\rightarrow$parietal cortex $\rightarrow$ motor neurons
B) Sensory neurons $\rightarrow$ sensory cortex $\rightarrow$ spinal interneurons
C) Sensory neurons $\rightarrow$ spinal interneurons $\rightarrow$ motor neurons
D) Sensory neurons $\rightarrow$ cerebellum $\rightarrow$ motor neurons

Question

Quizplus · Accepted Answer

When a child jerks his hand away from a hot pan, the sensory neurons (S1) detect the heat and send signals to the spinal interneurons (F1F1F1S1) which are responsible for reflex actions. These spinal interneurons activate the motor neurons (F1F1F1S1→F1F1F10) which cause the muscles in the child's arm to contract and move the hand away from the hot pan. Therefore, the correct path of information flow is sensory neurons→spinal interneurons→motor neurons. Option C accurately reflects this path. Option A is incorrect because it includes the parietal cortex which is not involved in this reflex. Option B is incorrect because it includes the sensory cortex which is not responsible for reflex actions. Option D is incorrect because it includes the cerebellum which is not involved in the reflex arc for jerking the hand away from a hot pan.

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