Arterial O2 and CO2 in Exercise Physiology - USMLE Forums
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Old 01-09-2012
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Lungs Arterial O2 and CO2 in Exercise Physiology

In normal exercise HR and CO increase to increase O2 and respiratory rate increase to elimenate excess Venous Co2 , since respiratory rate increase why arterial O2 and Co2 remain constant?
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Old 01-09-2012
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Correct Answer

During moderate exercise,
venous Po2 will decrease ( increased O2 extraction by tissues), this Bld will be carried to the lung where its hemoglobin will be fully saturated again so that arterial Po2 remains constant

venous CO2 will increase ( increased metabolism)---> stimulate central and peripheral chemoreceptors ---> hyperventilation ----> CO2 washing ---> arterial CO2 ( and PH ) return to normal .

hope this will help
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Old 01-09-2012
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thanks alot that is more than helpful
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Cardiovascular-, Physiology-, Respiratory-

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