In blood, an increase in which of the following increases the affinity of haemog

Question

In blood, an increase in which of the following increases the affinity of haemoglobin for oxygen: a)Temperature. b) PCO2 c) H d) 2,3-DPG e) none of the above. The partial pressure of oxygen (PO2) would be lowest in: a) inhaled gas. b) alveolar gas. c) systemic arterial blood d) systemic venous blood e) none of the above, as it is about the same in all. If the production of CO2 remained constant, and alveolar ventilation was doubled, what percentage of its former value will the PACO2 be after steady state is reached? a) 33 b) 50 c) 100 d) 200 e) 300 A climber resting at the peak of a mountain where the barometric pressure is 500 mm Hg has a PiO2 (mm Hg) in his upper airways closest to: a) 500 b) 450 c) 200 d) 100 e) 50

Explanation / Answer

1.e) none of the above

As temperature increases oxygen affinity decreases. As PCO2 increases, H+ increases and oxygen affinity decreases. 2,3 DPG reduces oxygen affinity.

2. d) systemic venous blood

In systemic circulation, the veins carry deoxygenated blood. Hence partial pressure of oxygen will be least in systemic venous blood.

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