Question

Question 2
Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Answer 1

Warm-blooded animals such as birds and mammals maintain a constant body temperature by cooling themselves when they are in a hotter environment and by warming their bodies when they are in a cooler environment. Hence, these animals require more oxygen $\left(O_2\right)$ for more cellular respiration so that they can produce more energy to maintain their body temperature. Maintenance of optimum body temperature is called thermo-regulation, regulated by the hypothalamus in the brain.

Thus, it is necessary to separate oxygenated and deoxygenated blood.