O Level Biology Study Guide: Certification Test 1425

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MCQ: 1425

The "dub" sound is produced when

atria are fully contracted
atria start to relax
after the semilunar valves are closed
after the bicuspid and tricuspid valves suddenly close

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Mode of action of heart Study Guide: O Level Biology App & eBook Notes

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Mode of action of heart Notes App Download & e-Book - 1425

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