Question

Explain the advantage of the complete partition of ventricle among birds and mammals and hence leading to double circulation.

Answer 1

The birds and mammals have evolutionary advancement as far as the structure of the heart is concerned. They need more oxygen to live in the terrestrial habitat.

In these animals, the blood received by the left and right auricles is oxygenated and deoxygenated respectively. It passes towards the left and right ventricles and thus no oxygenated and deoxygenated blood is mixed. The ventricles pump oxygenated deoxygenated blood without mixing.

Thus, two separate circulatory pathways are found thus this type of blood circulation is called double circulation, which includes systemic and pulmonary circulation.