May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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35Gas ExchangeHard1 mark
Which row is correct for blood entering and leaving the capillaries at an alveolus?
partial pressure of oxygen in the blood of capillaries leaving an alveolusblood vessel that contains blood immediately after it has left the capillaries at an alveolus
Ahigher than the partial pressure of oxygen in the capillaries supplying blood to an alveoluspulmonary arteriole
Blower than the partial pressure of oxygen in the capillaries supplying blood to an alveoluspulmonary arteriole
Chigher than the partial pressure of oxygen in the capillaries supplying blood to an alveoluspulmonary venule
Dlower than the partial pressure of oxygen in the capillaries supplying blood to an alveoluspulmonary venule