A large proportion of oxygen is left unused i | vedclass

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(D) Under normal physiological conditions,our body tissues utilize only about $25 \%$ of the $O_{2}$ carried by arterial blood.Consequently,the venous

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Acts as a reserve during muscular exercises

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(D) Under normal physiological conditions,our body tissues utilize only about $25 \%$ of the $O_{2}$ carried by arterial blood.Consequently,the venous blood remains approximately $75 \%$ saturated with $O_{2}$.This remaining oxygen serves as a vital reserve,which can be utilized by the body during periods of increased metabolic demand,such as intense muscular exercise.

$A$ large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This $O_{2}$

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