Question

Why blood circulation in human heart is called double circulation?

Answer 1

Explanation:

The oxygenated blood from the lungs returns to the heart, which is pumped again into different parts of the body by the heart. Thus, the blood passes twice through the heart making one complete round through the body. This is called double circulation.

here u go for your answer❤

Answer 2

Hii

you are welcome in my ans

in Heart there is four chamber and two valves where circulation of blood takes place that's why it is called

____/\___☺️

hope it may helps you ✊✌️