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ECG Curve

Pulmonary sem...

Question

Pulmonary semilunar valves are closed during __________ systole.

A

atrial

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B

discontinuous

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C

ventricular

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D

continuous

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Solution

The correct option is A
atrial

During atrial systole, blood enters the ventricles through bicuspid and tricuspid valves. Pulmonary semilunar valves close to prevent the back flow of the blood into the ventricles. This closure produces a 'Dub' sound which is the sound heard on placing a stethoscope onto the chest and listening.

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Similar questions

Q. Choose the correct sequence of events in the cardiac cycle:
I. Ventricular systole
II. Blood reaches ventricles
III. A-V valves closes
IV. Atrial systole
V. Semilunar valve closes
VI. Blood goes to major arteries
VII. Semilunar valve opens
VII. Ventricular diastole

Q. Which of the following events does not take place during a ventricular systole
i. Due to the ventricular systole, ventricular pressure decreases.
ii. During the end of ventricular systole the semilunar valves open up.
iii. During the start of the ventricular systole the bicuspid and tricuspid valves close
iv. Due to the closure of the atrio-ventricular valves, dup sound is produced.

Q. Where are the following located? (iii) Pulmonary semilunar valves.

Q. Pulmonary semilunar valve is found

Q. When the pulmonary valve closes, ventricular ___________ takes place leading to a _____ sound.

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