What is meant by double circulation as given in NCERT solutions for class 11 biology chapter 18?
Answer (1)
Double circulation is a process during which blood passes twice through the heart during one complete cycle. This type of circulation is found in amphibians, reptiles, birds, and mammals.
However, it is more prominent in birds and mammals as in them the heart is completely divided into four chambers:
- the right atrium,
- the right ventricle,
- the left atrium, and
- the left ventricle.
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