Choose the correct answer from the four options given below each statement.
A reflex arc in man is best described as movement of stimuli from
A. receptor cell, sensory neuron, relaying neuron, effector muscles.
B. receptor cell, efferent nerve, relaying neuron, muscles of the body.
C. receptor cell, spinal cord, motor neuron, relaying neuron.
D. receptor cell, synapse , motor neuron, relaying neuron.

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Solution

Choose the correct answer from the four options given below each statement.
A reflex arc in man is best described as movement of stimuli from
(a) receptor cell, sensory neuron, relaying neuron, effector muscles.
(b) receptor cell, efferent nerve, relaying neuron, muscles of the body.
(c) receptor cell, spinal cord, motor neuron, relaying neuron.
(d) receptor cell, synapse , motor neuron, relaying neuron.
Correct answer: (a) receptor cell, sensory neuron, relaying neuron, effector muscles.
Most reflex actions are controlled by the spinal cord through reflex arcs. The path followed by electrical impulses in a reflex arc is as follows:

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The sequence of the components of a reflex arc is

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

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