A circulatory system that does not allow mixing of oxygenated and de-oxygenated blood in mammalian heart is referred to as

A circulatory system that does not allow mixing of oxygenated and de-oxygenated blood in mammalian heart is referred to as closed. The closed circulatory system is one in which blood is pumped through the vessels by the heart and remains confined within a continuous system of vessels. In mammals, the heart has four chambers: two atria and two ventricles, and there is no direct communication between the two sides of the heart. The right side of the heart receives de-oxygenated blood from the body and pumps it to the lungs for oxygenation, while the left side of the heart receives oxygenated blood from the lungs and pumps it to the body. Therefore, there is no mixing of oxygenated and de-oxygenated blood in the mammalian heart, and this is what makes it a closed circulatory system.