how does the heart works to perfom its function
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basically explaining the structure of the heart and explaining blood flow
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Basically the heart is a muscle that pumps blood around the body. It consists of four chambers - the right atrium, the left atrium, the right ventricle and the left ventricle. When you view the diagram of the heart the right is shown on the left of the diagram and the left is shown on the right of the diagram (sounds confusing but it is important). There are also veins, arteries and valves in the heart, but I'll come to those later.
The left side of the heart deals with oxygenated blood, while the right side of the heart deals with deoxygenated blood.
The right side of the heart has the role of sends deoxygenated blood from the body, to the lungs so that it can be oxygenated. The deoxygenated blood enters the right atrium via the vena cava. When the atria contract, the blood passes into the right ventricle via the right atrioventricular valve (also called the tricuspod valve). Then when the ventricles contract, the blood leaves the right ventricle and passes into the pulmonary artery via the pulmonary semilunar valve. The blood now goes to the lungs.
The left side of the heart deals with oxygenated blood that has come from the lungs and needs to be transported to the rest of the body. The oxygenated blood enters the left atrium via the pulmonary vein (not artery). When the atria contract, the blood passes into the left ventricle via the left atrioventricular valve (bicuspid valve). Then when the ventricles contract, the blood leaves the left ventricle and passes into the aorta, via the aortic semilunar valve. The blood now goes to the rest of the body.
Hope this helps =]