MDCAT Biology MCQ #2106

The 'lub' sound heard during a heartbeat is due to the closure of which valves?

MDCAT Biology MCQ #2106

  1. Question 1

    Q1. The 'lub' sound heard during a heartbeat is due to the closure of which valves?

    • A) Semilunar valves
    • B) Atrioventricular valves
    • C) Pulmonary valves
    • D) Aortic valves

    Answer: Atrioventricular valves

    Explanation: The 'lub' sound is due to the closure of atrioventricular valves. 'Dub' sound is due to semilunar valves closure.