O Level Biology MCQs – Certification Test 4

Mode of action of heart Quiz (Question 4) – App & e-Book Download

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MCQ 4: The "lub" sound is produced after the:

ventricles are fully contracted
ventricles start to relax
bicuspid and tricuspid valves suddenly close
semilunar valves are closed

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O Level Biology Quiz App & e-Book – Mode of action of heart Study Guide

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