The following diagram indicates the reflex ar | vedclass

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(A) In a reflex arc,the pathway of a nerve impulse is as follows:$1$. $A$ represents the sense organ (receptor) which detects the stimulus.$2$. $B$ re

Vedclass · Accepted Answer

$A =$ sense organ; $B =$ sensory nerve; $C =$ dorsal horn; $D =$ interneuron; $E =$ ventral horn; $F =$ motor nerve; $G =$ effector

Vedclass · Answer

(A) In a reflex arc,the pathway of a nerve impulse is as follows:$1$. $A$ represents the sense organ (receptor) which detects the stimulus.$2$. $B$ represents the sensory nerve (afferent neuron) which carries the impulse towards the central nervous system.$3$. $C$ represents the dorsal horn of the spinal cord grey matter,where sensory neurons enter.$4$. $D$ represents the interneuron (relay neuron) which connects sensory and motor neurons.$5$. $E$ represents the ventral horn of the spinal cord grey matter,where motor neurons exit.$6$. $F$ represents the motor nerve (efferent neuron) which carries the impulse away from the central nervous system.$7$. $G$ represents the effector (muscle or gland) which performs the response.Therefore,the correct sequence is $A =$ sense organ,$B =$ sensory nerve,$C =$ dorsal horn,$D =$ interneuron,$E =$ ventral horn,$F =$ motor nerve,$G =$ effector.

The following diagram indicates the reflex arc. Identify the parts labelled as $A, B, C, D, E, F$ and $G$. Choose the correct option.

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