Mechanism of heart.

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In the last line...there is 'by' in place of 'why'..

The heart is roughly triangular in shape. It is made of special muscle cardiac cell. The heart has four Chambers inside it. The upper two chambers are called Atrium and the lower two chambers are called ventricles. The two Atria receive blood from the 2 main veins. And the 2 ventricles transport blood to the entire body and lungs. The left Atrium is connected to the left ventricle through a valve V1 and the right Atrium is connected to the right ventricle to another valve V2. These valves prevent backflow of blood into Atria when the ventricle contract to pump blood out of heart to the rest of body. When the muscles of all the four Chambers of the heart are relaxed, the Pulmonary vein brings deoxygenated blood from the lungs into the left Atrium of the heart. When the left Atrium contracts, the oxygenated blood is pushed into the left ventricle through the valve V1. When the left ventricle contracts, the oxygenated blood is forced into the main artery called Aorta and then go into different body organs except the lungs. The main artery carry blood to all organ of the body. When the right Atrium contracts the ,deoxygenated blood is pushed into the right ventricle through the valve V2. And when the right ventricle contracts, deoxygenated blood is pumped into the lungs through the Pulmonary artery. In the lungs , deoxygenated blood releases its carbon dioxide and observes fresh oxygen from air. So, the blood becomes oxygenated again. This oxygenated blood is again sent to the left Atrium of heart why Pulmonary vein for circulation in the body.

Conduction,convection and radiation

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