Question

required information
the atrioventricular valves open during
multiple choice
ventricular systole
ventricular diastole
atrial systole
atrial diastole
both atrial and ventricular systole

Explanation:

During ventricular diastole, the ventricles relax. The pressure in the ventricles drops below the pressure in the atria. This pressure gradient causes the atrioventricular valves (mitral and tricuspid valves) to open, allowing blood to flow from the atria into the ventricles. In ventricular systole, the valves close due to higher ventricular pressure. Atrial systole is a part of the cardiac cycle where atria contract to push more blood into ventricles, but the main opening of atrioventricular valves is due to ventricular relaxation (diastole). Atrial diastole is when atria relax. And the situation of both atrial and ventricular systole doesn't lead to atrioventricular valve opening as ventricular pressure would be high.

Answer:

ventricular diastole