O Level Biology MCQs – Certification Test 13

Mode of action of heart Trivia (Question 13) – App & e-Book Download

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MCQ 13: In the cardiac system, systole means:

a "lub" sound
ventricular relaxation
closure of semilunar valves
a "dub" sound

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

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