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PLEASE EXPLAIN ME ABOUT THE FUNCTIONS HAPPEN IN THE HEART?

The heart circulates blood through two pathways: the pulmonary circuit and the systemic circuit.
In the pulmonary circuit, deoxygenated blood leaves the right ventricle of the heart via the pulmonary artery and travels to the lungs, then returns as oxygenated blood to the left atrium of the heart via the pulmonary vein.

In the systemic circuit, oxygenated blood leaves the body via the left ventricle to the aorta, and from there enters the arteries and capillaries where it supplies the body's tissues with oxygen. Deoxygenated blood returns via veins to the venae cavae, re-entering the heart's right atrium.
After the blood leaves the heart through the aortic valve, two sets of arteries bring oxygenated blood to feed the heart muscles.The left main coronary artery, on one side of the aorta, branches into the left anterior descending artery and the left circumflex artery. The right coronary artery branches out on the right side of the aorta.
A little more elaboration :

Arterial blood (red, oxygen-rich blood) flows from the heart to each part of the body to provide oxygen and nutrients. The venous blood (blue, oxygen-poor blood) returns from the body to the heart. The blood then travels through the lungs to exchange carbon dioxide for new oxygen. The heart is a pump, which moves the blood. The arteries and veins are the pipes through which the blood flows. The lungs provide a place to exchange carbon dioxide for oxygen.The heart is a hollow, muscular organ, which functions as a pump for the movement of blood through the body. The flow of blood through the four chambers of the heart is regulated by valves. The heart valves function like one-way doors which allow blood flow through in the forward direction but prevent the backward flow of blood. Venous blood returns from the body to the right side of the heart which pumps the blood to the lungs. The oxygen-rich blood returns from the lungs to the left side of the heart. The left side of the heart pumps blood to the entire body. As you would expect, the left side of the heart must generate a much greater pressure to pump the blood to the body. On the left side the valves are called mitral and aortic valves. The mitral valve connects the receiving chamber from the lungs, the left atrium, with the pumping chamber, the left ventricle. The aortic valve controls the flow of blood out of the heart into the aorta, the largest artery of the body which then gives rise to all the other arteries.


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