Select the incorrect statement about the circulatory system of birds and mammals.

Moderate

A

Oxygenated and deoxygenated blood are received by the right and left atria respectively.
B

The heart is four-chambered, with two atria and two ventricles.
C

The ventricles pump the blood without any mixing up of oxygenated and deoxygenated blood.
D

Two separate (systemic and pulmonary) circulatory pathways occur in these organisms.

Solution

In birds and mammals, oxygenated and deoxygenated blood received by the left and right atria respectively passes on to the ventricles of the same sides. The ventricles pump it out without any mixing up, i.e., two separate circulatory pathways are present in these organisms, hence, these animals have double circulation.

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