But when the right ventricle actually contracts, it moves deoxygenated blood from the right ventricle into the pulmonary arteries. And valve number two pulmonary valve is actually open. So when valve number one is open, valve number two is closed. But when valve number one is closed, valve number two is open. Now what about the left pump of our heart? This consists also of an atrial ventricular valve, but this one is known as the left atrial ventricular valve.