First slide

Circulatory Pathways

Question

Which one of the following is true about atrial systole?

Easy

A

Ventricular pressure exceeds atrial pressure
B

It increases the flow of blood into the ventricles by about 30 per cent
C

Atrioventricular valves are closed and semilunar valves are open
D

It is represented by the QRS complex on ECG

Solution

Atrial systole increases the flow of blood into the ventricles by about 30 per cent. During atrial systole, atrial pressure exceeds ventricular pressure. Atrioventricular valves are open and semilunar valves close. Atrial systole is represented by P wave on ECG.

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