Question

How do fishes cope up with two chambered heart where oxygenated and deoxygenated blood mix up unlike mammals which have four chambered heart for efficient flow of blood?

• A. Fishes do not require energy to maintain body’s temperature.
• B. Fishes have efficient gills.
• C. Fishes do not have complex body structure like mammals.
• D. Fishes can store more energy than mammals.

Answer 1

The correct option is A

Fishes do not require energy to maintain body’s temperature.

In fishes and reptiles, there is mixing of blood (oxygenated and deoxygenated) due to less number of chambers in the heart. In humans, there is a separation of pure and impure blood flow in separate chambers for more efficient transport and faster energy production which is needed for body temperature maintenance. The same is not required in fishes and reptiles as their body temperature alters with the surroundings and they can afford mixing of pure and impure blood.