Question

Describe the pressures in the atria and ventricles that would cause the opening of the AV valves. Pressures in the atria and ventricles would be equal. Pressure in the ventricles would be greater than in the atria. Pressure in the atria would be greater than the pressure in the ventricles.

Answer 1

The pressures in the atria and ventricles that would cause the AV valves to open. This is when the pressure in the atria would be greater than the pressure in the ventricles.

What does pressure in the atria cause?

The pressure drops below 120 mmHg as the ventricles relax, causing the semilunar valves to close. As the pressure continues to fall, the atrial pressure exceeds that of the ventricles, and the atrioventricular valves open. Meanwhile the blood is being pumped around the body.

With this information, we can conclude that the pressure in the atria would be greater than the pressure in the ventricles.

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