Question

Voluntarily hyperventilation increases the

A. Negative charge on the plasma proteins.

B. Level of ionized calcium in blood.

C. Alveolar PO2 three-fold when ventilation is increased three-fold.

D. Arterial blood oxygen saturation by 10–15 per cent when ventilation is increased by 10–15 per cent.

E. The renal excretion of bicarbonate.

Answer 1

A. True It makes it more negative by raising blood pH.

B. False It decreases as protein binding of calcium increases.

C. False Alveolar PO2 cannot exceed the PO2 of the air being breathed (160 mmHg, 21 kPa).

D. False The blood is normally almost fully saturated (95–98 per cent).

E. True To compensate for the respiratory alkalosis.