Describe double circulation in human beings. Why is it necessary? Answer: The circulation of blood in the Human heart goes as follows: The left atrium of the heart receives oxygenated blood from the lungs. It further moves down to the left ventricle. This blood is then pumped through the aorta to the entire body , to supply cells and tissues with oxygen. Oxygen poor blood (deoxygenated blood) from the various body parts, returns to the heart. This blood enters the right side of the heart ... Double circulation is a circulatory system where blood passes through the heart twice in one complete circuit. Understanding this gets easier with a double circulation diagram and flowchart. Double circulation is a process during which blood passes twice through the heart during one complete cycle. This type of circulation is found in birds, and mammals as in them the heart is completely divided into four chambers – the right atrium, the right ventricle, the left atrium, and the left ventricle. In animals, there are two types of circulatory systems: open circulatory system and closed circulatory system. The majority of mammals, including humans, use a double circulatory system.
