In the knee-jerk reflex,

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the stimulus is the stretching of muscle and the response is its contraction

the efferent neuron receives a signal from a sensory organ

the sensory impulse is transmitted to the CNS through the ventral root of a spinal nerve

an interneuron carries impulses from an efferent neuron to an afferent neuron

answer is C.

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Detailed Solution

Stretching of the muscle is the stimulus which is perceived by the muscle spindle. The sensory signal passes through the afferent neuron to the spinal cord from which motor impulse to the muscles causes the muscle to contract in response to stretching.

The afferent neuron receives a signal from a sensory organ.

The sensory impulse is transmitted to the CNS the dorsal root of a spinal nerve.

Any interneuron carries impulses from afferent neuron to efferent neuron.

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