Can you please explain to me what an atrial valve is and what it does??
You're incorrectly combining two parts of the human heart, atrium(atria) and valves. The human heart has four chambers, two superior ATRIA and two inferior ventricles. The atria are the receiving chambers and the ventricles are the discharging chambers. The pathway of blood through the human heart consists of a pulmonary circuit and a systemic circuit. Blood flows through the heart in one direction, from the atria to the ventricles, and out of the great arteries, or the aorta for example. This is done by four VALVES which are the tricuspid valve, the mitral valve, the aortic valve, and the pulmonary valve
Only Veins have Valves that's in order to keep blood pumping inside, with the help of Skeletal muscles. About Atrial Valves, there's a valve in the Pulmonary artrey only.
By atrial valve, I assume it meant the atrioventricular valves. Basically, in the heart, the blood flows from right atrium, right ventricle, left atrium, left ventricle. The atrioventricular valves are the tricuspid and bicuspid valves. They make sure the blood flows from the right atrium - right ventricle and left atrium - left ventricle respectively and prevents blood from flowing the wrong way in those chambers.
