A student accidentally touches a hot surface and immediately withdraws her hand. Which statement BEST explains why this response occurs so rapidly?

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Question

A student accidentally touches a hot surface and immediately withdraws her hand. Which statement BEST explains why this response occurs so rapidly?

Accepted Answer

C. The response is coordinated in the spinal cord without waiting for the brain to process the signal — In a spinal reflex, the response is coordinated at the level of the spinal cord, which dramatically shortens the pathway and reduces response time. The brain does eventually receive information about the event but this happens after the withdrawal has already occurred. The impulse does not bypass the spinal cord.

Answer

B. The impulse bypasses the spinal cord and travels straight to the effector

Answer

A. The brain sends a fast signal directly to the hand muscles

Answer

D. The pain receptors in the skin amplify the signal before sending it to the brain

Answer

C. The response is coordinated in the spinal cord without waiting for the brain to process the signal

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