The heart contracts twice for every heartbeat. One contraction is the atrial contraction while the other is the ventricular contraction. During ventricular contraction, which two valves of the heart open?

Pulmonary and aortic valves

Explanation:

The heart is a muscular organ which helps in pumping the blood and ensuring oxygenated blood to the vital organs of the body.

The heart also serves the function of providing oxygen to the different parts of the body which is dissolved in the blood.

The heart is made of four chambers two lower chambers( ventricle) and two upper chambers( atria).

The aortic valve is the valve in the human heart which is located in the between the left ventricles and the aorta and the pulmonary valve is located between the blood flows from right ventricle to pulmonary artery.