Mixing up of arterial and venous blood does n | vedclass

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(B) In a $4$-chambered heart,the heart is divided into two atria and two ventricles. This complete separation ensures that oxygenated (arterial) blood

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Four chambers

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(B) In a $4$-chambered heart,the heart is divided into two atria and two ventricles. This complete separation ensures that oxygenated (arterial) blood and deoxygenated (venous) blood do not mix. In contrast,$2$-chambered hearts (found in fish) have a single circulation where blood passes through the heart once,and $3$-chambered hearts (found in amphibians and most reptiles) allow for the mixing of oxygenated and deoxygenated blood in the single ventricle.

Mixing up of arterial and venous blood does not take place in a heart having

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