Question

Why is blood circulation in human heart called double circulation?NCERT Class XScience - Exemplar ProblemsChapter_Life Processes

Answer 1

Because first of all the blood comes out of the arteries to the heart and goeslungs and then from lungs back toh the heart and then to the whole body..

Answer 2

Answer:

In human heart, blood passes through the heart twice during one cardiac cycle. The deoxygenated blood comes to the heart and goes to the lungs for oxygenation. Simultaneously, the oxygenated blood comes to the heart from lungs and goes to different organs. Due to this, blood circulation in human heart is called double circulation.