What could be the possible explanation for evolution of four-chambered heart in mammals as opposed to two-chambered heart in fishes?
What could be the possible explanation for evolution of four-chambered heart in mammals as opposed to two-chambered heart in fishes?
The correct options are
A Fishes do not require energy to maintain body’s temperature.
C Fishes do not have complex body structure like mammals.
In Fishes and Reptiles, the heart is two chambered and there is mixing of oxygenated and deoxygenated blood. But higher up the ladder, in birds and mammals, heart has four chambers and oxygenated blood and deoxygenated blood is kept strictly separated. The possible explanation for this evolution is,
Fishes and reptiles are cold blooded (the body temperature varies according to the surrounding temperature). So energy is required only for locomotion and hence less amount of oxygen is sufficient.
Birds and mammals are warm blooded, so more energy is required to keep up the body temperature. Thus the requirement of energy and hence oxygen is more and therefore oxygenated and deoxygenated blood cannot be mixed.
Also, complexities in the body structure and different mechanisms have increased with evolution. Therefore the mechanism of circulation is also evolved.
A
Fishes do not require energy to maintain body’s temperature.
C
Fishes do not have complex body structure like mammals.
In Fishes and Reptiles, the heart is two chambered and there is mixing of oxygenated and deoxygenated blood. But higher up the ladder, in birds and mammals, heart has four chambers and oxygenated blood and deoxygenated blood is kept strictly separated. The possible explanation for this evolution is,
Fishes and reptiles are cold blooded (the body temperature varies according to the surrounding temperature). So energy is required only for locomotion and hence less amount of oxygen is sufficient.
Birds and mammals are warm blooded, so more energy is required to keep up the body temperature. Thus the requirement of energy and hence oxygen is more and therefore oxygenated and deoxygenated blood cannot be mixed.
Also, complexities in the body structure and different mechanisms have increased with evolution. Therefore the mechanism of circulation is also evolved.
