Question

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

Answer 1

Hint: Warm-blooded animals are mammals and birds. To regulate their body temperature, they continuously use energy. They have higher energy requirements and thus need more oxygen to create energy.

Complete answer:
> Through cooling themselves when they are in a colder climate and by warming their bodies when they are in a colder climate, warm-blooded animals such as birds and mammals retain constant body temperature.
> There is a double circulating system in birds and mammals where both the oxygenated and deoxygenated blood is kept separate.
> Thus, for more cellular respiration, these animals need more oxygen so that they can generate more energy to sustain their body temperature.
> If the oxygenated blood remains different, it is even safer, as its combination with deoxygenated blood would impure the whole blood.
> They also need to separate oxygenated and deoxygenated blood so that their circulatory system is more effective and that their body temperature can be controlled continuously.

Additional information:
In the circulation, 'oxygenated' blood receives oxygen from the lungs by binding it to hemoglobin.
'De-oxygenated' blood returns to the lungs with oxygen-depleted haemoglobin. The blood would also transport the resulting carbon dioxide for exhalation back to the lungs.
Oxygenated blood has a significant proportion of red blood cells bearing oxygen on the haemoglobin De Oxygenated blood has less oxygen and more carbon dioxide being borne by the haemoglobin.
Oxygenated blood: lung $ \to $ left chambers of the heart $ \to $ body
Deoxygenated blood: body $ \to $ right chambers of the heart $ \to $ lung

Note: In the lungs, by absorption, the pulmonary capillaries absorb oxygen. The lungs have a lower oxygen content than the lungs, so oxygen diffuses through the blood through the thin membrane of the capillaries. This causes oxygenation to occur in the blood.