Gce Model Questions Vol1 2025 Biology Question 17
Practice objective / multiple choice question 17 from the 2025 Gce Model Questions Vol1 Biology examination.
Refer to the labelled diagram of the respiratory system. The diagram shows the partial pressures of oxygen (\(pO_{2}\)) in four compartments: external air (\(pO_{2}=160\) mmHg), alveolar air (\(pO_{2}=100\) mmHg), pulmonary capillary blood (\(pO_{2}=40\) mmHg) and venous blood (\(pO_{2}=30\) mmHg).\n\n(a) State the direction of diffusion of oxygen between the alveolar air and the pulmonary capillary blood.\n(b) Calculate the magnitude of the oxygen partial‑pressure gradient driving this diffusion.
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This is Gce Model Questions Vol1 2025 Biology Question 17. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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