Nerve impulses travel at different speeds, depending on the type of fiber throug

Question

Nerve impulses travel at different speeds, depending on the type of fiber through which they move. The impulses for touch travel at approximately 75.01 m/s, while those registering pain move at approximately 0.618 m/s. Assume that person's brain is 1.81 m from his toe and that the impulses travel directly from toe to brain. If a person stubs his toe, find the time for the impulse for touch to reach his brain.If a person stubs his toe, find the time for the impulse for pain to reach his brain. Find the time delay between the pain and touch impulses.

Explanation / Answer

The time it takes for touch to reach his brain is (1.81 m)/(0.618 m/s) = 2.93s The time it takes for pain to reach his brain is (1.81 m)/(75.01 m/s) = 0.0241s The delay is then 2.93s - 0.0241s = 2.91s

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