What is double circulation of blood …

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The basis of our double circulatory system is all about oxygen. The first loop is called the systemic circuit. In this loop, oxygenated blood moves from the heart to our body, where it off-loads oxygen to our muscles, tissues and organs. At the same time, this blood picks up carbon dioxide and other waste products

DOUBLE CIRCULATION : When one cycle of blood circulation is completed , a fixed quantity of blood flows through the heart twice called double circulation .Duble circulation has tow different circuits One for oxygenated blood and the other for de oxygenated blood. Eg: Human heart

DOUBLE CIRCULATION :- Two paths of circulation are there-

THE PULMONARY CIRCULATION
The Deoxygenated blood is pumped through pulmonary artery.
The blood becomes oxygenated 
The Oxygenated blood flows through pulmonary veins to left auricle.
Deoxyge nated blood in right ventricle 
Lung capillaries absorbs oxygen and loses carbon dioxide Oxygen-rich blood 
Pulmonary veins carry oxygen-rich blood .

THE SYSTEMIC CIRCULATION
The human circulatory system 
Oxygenated blood in left ventricle
The oxygenated blood is pumped through aorta to all parts of the body except lungs 
O₂ and nutrients diffuse into cells while CO₂ and wastes diffuse out
The blood flows through inferior/ superior vena cava to right auricle .
Oxygen-rich blood returns to the heart through pulmonary veins 
Left ventricle pushes the blood out through the main artery, the aorta