First we understand about a double circulation?
The majority of mammals including humans have a double circulatory system, i.e. we have two loops in our body where the blood circulates.
Double circulation is the movement of blood in the whole body and it involves the flow of Deoxygenated blood: Little to no oxygen, and a lot of carbon dioxide and another is Oxygenated blood: Oxygen-rich
Two Types of Circulation: Double Circulation in Human
Lungs are involved in this type of circulation.
In this pathway, when deoxygenated blood is transferred to the lungs via the pulmonary artery and that deoxygenated blood comes from the right atrium to the right ventricle and then pulmonary artery.
Now, carbon dioxide is removed and oxygen enters as a result of which blood carries oxygenated blood.
This oxygenated blood is carried by Pulmonary Vein to the Left Atrium. Further, this blood goes to the Left Ventricle.
All systemic organs and tissues are involved in this type of circulation.
Oxygenated blood will go to the tissues and organs via Aorta when then becomes deoxygenated as a result of by-products (Carbon di oxide) of metabolic and respiration processes.
This deoxygenated blood is carried by Vena Cava to the right atrium and then further into the right ventricle.
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