A 50 year old man is undergoing a neurophysiological study of the reflex arc timing for different reflexes in his right leg, as a part of follow up after a nerve injury. His knee jerk recorded an arc time that was short compared to flexor withdrawal reflex.
Which is the most likely explanation for this difference?

Question

A 50 year old man is undergoing a neurophysiological study of the reflex arc timing for different reflexes in his right leg, as a part of follow up after a nerve injury. His knee jerk recorded an arc time that was short compared to flexor withdrawal reflex. 
 Which is the most likely explanation for this difference?

Answer

Tendon jerk is monosynaptic while flexor withdrawal is a polysynaptic reflex

Answer

Tendon jerk receptor has faster activation time than flexor withdrawal reflex

Answer

Tendon jerk afferent is thick A fiber while flexor withdrawal afferent is B fiber

Answer

Tendon jerk is processed in the spinal cord while flexor withdrawal reflex is processed in the brain stem

Answer

Tendon jerk efferent is alpha motor neuron while flexor withdrawal reflex afferent is gamma motor neuron

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A 50 year old man is undergoing a neurophysiological study of the reflex arc tim...

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