A: When a person starts doing exercise,the ra | vedclass

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(A) $1$. During the initiation of physical exercise,the body requires an immediate increase in oxygen supply and carbon dioxide removal.$2$. The respi

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) $1$. During the initiation of physical exercise,the body requires an immediate increase in oxygen supply and carbon dioxide removal.$2$. The respiratory centers in the medulla oblongata and pons receive anticipatory signals from the cerebral cortex and sensory inputs from proprioceptors located in joints and muscles.$3$. These proprioceptors detect the movement of limbs even before chemical changes (like a drop in $pO_2$ or rise in $pCO_2$ and $H^+$) occur in the blood.$4$. This neural mechanism allows for a rapid adjustment in the rate and depth of breathing to meet the metabolic demands of the muscles.$5$. Therefore,both the Assertion and the Reason are correct,and the Reason provides the correct explanation for the observed phenomenon.

$A$: When a person starts doing exercise,the rate and depth of breathing increase even before there are changes in $pO_2$,$pCO_2$,or $H^+$ concentration.
$R$: The main stimulus for these quick changes is due to input from the proprioreceptors,which monitor movements of joints and muscles.

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$A$: When a person starts doing exercise,the rate and depth of breathing increase even before there are changes in $pO_2$,$pCO_2$,or $H^+$ concentration.$R$: The main stimulus for these quick changes is due to input from the proprioreceptors,which monitor movements of joints and muscles.