Which of the following classes of animals has/have three-chambered

by

Which of the following classes of animals has/have three-chambered heart?

Pisces and Amphibia
Amphibia and Reptilia
Reptilia only
Amphibia only
This question was previously asked in
UPSC CDS-1 – 2018
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The correct answer is B) Amphibia and Reptilia.
Amphibians (like frogs, salamanders) typically have a three-chambered heart consisting of two atria and one ventricle. Most reptiles (like lizards, snakes, turtles) also possess a three-chambered heart with two atria and a single ventricle, although the ventricle is often partially divided by a septum, reducing mixing of oxygenated and deoxygenated blood. Crocodiles are an exception among reptiles, having a four-chambered heart.
Fishes (Pisces) have a two-chambered heart. Birds and Mammals both have a four-chambered heart. The evolution from two to three to four-chambered hearts reflects increasing efficiency in separating oxygenated and deoxygenated blood, which is beneficial for higher metabolic rates in endothermic animals (birds and mammals).

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