Contents
Part 2 of 3
One beat, step by step
identify
Try it yourself
Supplement. The diagram shows a section through a mammal's heart. Which letter shows a semilunar valve?
identify: name or select.
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Scope and sources
Cambridge IGCSE Biology 0610 · 2026–2028 v3 · Original learning materials.
The circulatory system as blood vessels with a pump and valves for one-way flow (9.1.1); the single circulation of a fish, the double circulation of a mammal and its advantages (9.1.2–9.1.4); the structures of the mammalian heart (9.2.1); arteries carry blood away from the heart and veins return it (9.2.2); the atrioventricular and semilunar valves (9.2.7); the relative thickness of the walls (9.2.8); the septum (9.2.9); the contraction of the atria and the ventricles and the action of the valves (9.2.10). Heart rate, exercise and coronary heart disease are in Exercise and heart health, the blood vessels themselves in Blood vessels, and blood in Blood. The pressures and times in the experiment are illustrative values for an adult at rest.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus