Question

explain with help of diagram of double circulation of blood

Answer 1

One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide. The blood passes through the heart twice through separate pathways for completing one cycle . This circulation is called double blood circulation

Answer 2

Double circulation refers to the circulation of blood to 2 different pathways namely:

1) Pulmonary circulation

The blood from the right ventricle is taken to the lungs via the pulmonary artery for oxygenation. The blood after oxygenation at the lungs is drained in the left atrium as oxygenated blood by the pulmonary vein.

2) Systemic circulation

The oxygenated blood from left ventricle is transferred into the aorta which carries the blood to different parts of the body. Once this blood is delivered to cells, the carbon-dioxide rich deoxygenated blood is collected by the superior and inferior vena cava and drained back into the right atrium.

Thus the blood is pumped by heart to 2 different pathways and thus called double circulation.