A reflex arc does not involve

A receptor

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A sensory pathway

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A motor pathway

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The brain

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Solution

The correct option is D The brain
The reflex arc is a simple nervous pathway and consists of a sensory receptor, afferent neuron, center, efferent neuron and effector organ. The afferent/sensory neurons transmit the sensory information from sensory receptors to the spinal cord (sensory pathway). The interneurons of spinal cord integrate the incoming information and signal is relayed to motor/efferent neurons. The motor pathway transmits the signal from motor neurons to the effector organs (muscles and glands etc). Thus, reflex arc transmits the information from receptor to effector via the spinal cord. The brain is not the part of the reflex arc. Thus, option D is the correct answer.

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Similar questions

The sequence of the components of a reflex arc is

$R e c e p t o r s \to S p i n a l c o r d \to S e n s o r y n e u r o n \to M o t o r n e u r o n \to M u s c l e s$

One of the following gives the correct sequence of the components in a reflex arc. This is :

(a) Receptors $\to$ Muscle $\to$ Sensory neuron $\to$ Motor neuron $\to$ Spinal cord

(b) Receptors $\to$ Motor neuron $\to$ Spinal cord $\to$ Sensory neuron $\to$ Muscle

(d) Receptors $\to$ Sensory neuron $\to$ Spinal cord $\to$ Motor neuron $\to$ Muscle

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