External stimuli are communicated to the brain by means of electrical signals propagating along nerve cells at a speed of approximately 32 m/s. Similarly, electrical messages are sent at the same speed from the brain along nerve cells to the muscles. Reflex actions are controlled by a relatively simple nerve circuit from a muscle to the spine and back to the muscle. Estimate the reflex time for a stimulus at the knee. (assume that the signal resulting from the stimulus must travel a distance δs = 1 m.

Question

Physics

Steven Mcmahon

28 May, 08:48

External stimuli are communicated to the brain by means of electrical signals propagating along nerve cells at a speed of approximately 32 m/s. Similarly, electrical messages are sent at the same speed from the brain along nerve cells to the muscles. Reflex actions are controlled by a relatively simple nerve circuit from a muscle to the spine and back to the muscle. Estimate the reflex time for a stimulus at the knee. (assume that the signal resulting from the stimulus must travel a distance δs = 1 m.

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Dylan Nash · Answer 1

Answer;

= 31.25 ms or 0.03125 seconds

Explanation;

distance = speed * time

t = x/v

= 1.0 m/32 m/s

= 3.125 x10^-2 s

= 31.25 ms or 0.03125 seconds