Blood from the body enters the right atrium of the heart. Its pumped out of the right ventricle towards the lungs to pick up oxygen.
The blood is now oxygenated.It returns to the left atrium and passed into the left ventricle. Here it gets another harder pump which carries it around the rest of the body.
The left ventricle has a thicker wall of muscle than the right, because it has to pump blood to the whole of the body.
The right ventricle only pumps as far as the lungs.As the blood passes around the body it gradually gives up its oxygen to the cells.It becomes deoxygenated.
The blood the returns to the right atrium again.
So blood passes through the heart twice on every circuit of the body. This is called a double circulation.
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