May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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35Gas ExchangeMedium1 mark
How many phospholipid bilayers does an oxygen molecule pass through in diffusing from an alveolar air space to form oxyhaemoglobin in a red blood cell in a mammalian lung? (Assume that there are no pores between the cells the oxygen molecules must pass through.)