The human circulatory system circulates blood through two loops (double circulation) – One for oxygenated blood, another for deoxygenated blood. The main advantage of double circulation is that every tissue in the body has a steady supply of oxygenated blood, and it does not get mixed with the deoxygenated blood.
- Oxygenated blood is also called arterial blood. After the respiration in the lung, the blood has plenty of oxygen, and its color is bright red. Oxygenated blood flows in the pulmonary vein and in the arteries.
- Deoxygenated blood, known as venous blood has less oxygen than oxgenated blood. Its color is dark red. It travels through the venous system and pulmonary artery.
Path of Blood
Oxygenated blood: lung → left chambers of the heart → body
Deoxygenated blood: body → right chambers of the heart → lung