May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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15Heart CirculationEasy1 mark
The diagrams show the single circulation of a fish and the double circulation of a mammal.
Fish circulation and mammal circulation side by side. Fish: the heart (a ventricle and an atrium) is joined by vessel R to the gill capillaries, the gill capillaries are joined by vessel S to the body capillaries, and vessel T joins the body capillaries back to the heart. Mammal: the heart (atria and ventricles) is joined to the lung capillaries by vessel X on the left and vessel Y on the right, and to the body capillaries by vessel Z and a second vessel
Which letters represent areas of oxygenated blood?