Question

which of the following occurs during the ventricular - systole phase of the cardiac cycle?
the pressure in the ventricles is higher than the pressure in the aorta and pulmonary trunk.
the atria contract while the ventricles relax.
the atrioventricular valves open, and the semilunar valves close.
the pressure in the ventricles is lower than the pressure in the atria.
i dont know yet

Explanation:

During ventricular systole, the ventricles contract. This contraction causes the pressure in the ventricles to rise. When the ventricular pressure exceeds the pressure in the aorta (for the left ventricle) and the pulmonary trunk (for the right ventricle), the semilunar valves open, and blood is ejected from the ventricles. The atria are in diastole (relaxation) during ventricular systole. The atrioventricular valves close during ventricular systole to prevent back - flow of blood into the atria.

Answer:

The pressure in the ventricles is higher than the pressure in the aorta and pulmonary trunk.