what is double blood circulation? how its work?
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Double blood circulation is a system of blood supply in warm blooded animals such as mammals.
In this system, the blood travels from the heart twice, from the body to the heart and from the lungs to the heart (vice versa)
This system is absolutely necessary as mammals cant afford to lost the warmth of the blood. this system prevents the mixing of pure and impure blood.
in cold blood animals such as fish, the double circulation of blood isn't present
Hope your Eng exam went well .
GG
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