A: 100 ; ml of venous blood contains 14.4 ; m | vedclass

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(C) Under normal physiological conditions,$100 \; ml$ of oxygenated (arterial) blood carries approximately $19 \; ml$ of $O_2$.When this blood passes

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Assertion is correct,but Reason is incorrect.

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(C) Under normal physiological conditions,$100 \; ml$ of oxygenated (arterial) blood carries approximately $19 \; ml$ of $O_2$.When this blood passes through the tissues,about $5 \; ml$ of $O_2$ is delivered to the tissues,leaving $14.4 \; ml$ of $O_2$ in the venous blood.This means that venous blood remains $75\%$ saturated with oxygen at rest.The Reason statement provided is slightly inaccurate regarding the context of 'exercise' versus 'resting' conditions,as the $25\%$ delivery is the standard value for resting conditions,not exercise (where delivery increases significantly).Therefore,the Assertion is correct,but the Reason is technically incorrect due to the mention of 'exercise'.

$A$: $100 \; ml$ of venous blood contains $14.4 \; ml$ of $O_2$,meaning it is still $75\%$ saturated with oxygen under normal conditions.
$R$: About $4.6 \; ml$ of $O_2$,i.e.,$25\%$,diffuses from arterial blood into the tissues during resting conditions.

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$A$: $100 \; ml$ of venous blood contains $14.4 \; ml$ of $O_2$,meaning it is still $75\%$ saturated with oxygen under normal conditions.$R$: About $4.6 \; ml$ of $O_2$,i.e.,$25\%$,diffuses from arterial blood into the tissues during resting conditions.