describe double circulation in human beings. why it is necessary?
Dear Student,
@ Ashok:
You might be familiar with the circulation of blood. Now look at this image, this image is a schematic representation of blood circulation.
![](https://s3mn.mnimgs.com/img/shared/userimages/mn_images/image/blood%20circulation.png)
Here you can observe that the blood passes through the heart twice. Since the blood goes twice through the heart, it is known as double circulation. Warm-blooded animals like mammals have this type of blood circulation.
For the second part of your question you can refer to the answers given by your friends.
@ Sonakshi and gunjan: It's a great answer that you have provided! Keep up the good effort!
Cheers!!