May/June 2026 Paper 43

2026 · 10 questions · 31 parts · 100 marks

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7(a)7(b)7(c)(i)7(c)(ii)

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8(a)8(b)(i)8(b)(ii)

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6(a)Excretion OsmoregulationHard6 marks

In the kidney, ultrafiltration occurs when blood enters the glomerulus through the afferent arteriole. Describe the process of ultrafiltration.

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6(b)Excretion OsmoregulationMedium3 marks

Caffeine is a natural compound present in tea and coffee. Caffeine is also added to some drinks. Some people produce more urine after having a drink containing caffeine than after drinking an equivalent volume of water. Suggest ways in which caffeine may cause an increase in urine production in some people.

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