Double circulation has two components- Pulmonary circulaiion and systemic circulation.
Pulmonary circulation is a movement of blood from the heart to the lungs and back from the lungs to the heart. Deoxygenated blood of the body enters the right auricle, passes into right ventricle which pumps it into a pulmonary arch, two separate pulmonary arteries the blood passes into the lungs. Now Oxygenated blood from the lungs is carried block to the heart by : Pulmonary veins and enters into the left auricle of the heart Systemic Circulation is the circulation of blood between the heart and different parts of the body except lungs. Oxygenated blood received by left auricle passes into the left ventricle. The left ventricle pumps it into aorta for supply to different body parts including walls of the heart with the help of arteries.
