Describe double circulation of blood in human beings. Why is it necessary?


Anitha Dunga : Subject Matter Expert at edumarz

Solution : The human heart is divided into four chambers. Four chambers of the heart consist of two atrium and two ventricles which are divided into right atrium and left atrium, left ventricle and right ventricle.

Double circulation flow of blood in heart of human : 

  • The deoxygenated blood is collected from all parts of the body by the veins. The superior vena cava and the inferior vena cava are the veins that collect the deoxygenated blood from all parts of the body.

  • From veins the blood is flow to the right atrium, where the right atrium flows this deoxygenated blood to the right ventricle by contraction through the auriculo-ventricular aperture

  • The right ventricle then contracts and flows the blood into pulmonary arteries.

  • These pulmonary arteries pump the blood into the lungs, where the deoxygenated blood gets oxygenated in lungs. 

  • The pulmonary vein transports the oxygenated blood to the left atrium, when the left atrium contracts the oxygenated blood from the left atrium flows to the left ventricle by the auriculo-ventricular aperture. 

  • The blood from the left ventricle passes to the aorta, where the aorta divides into many arteries, these arteries distributed to all parts of the body carrying oxygenated blood. 

  • In this process the blood goes twice through the heart so called double circulation.

Importance of blood circulation

Double circulation in humans is needed for the separation of the oxygenated blood from the deoxygenated blood.


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