Question

The number of chambers in amphibian heart is:
A.Three
B.Four
C.Five
D.Two

Answer 1

Hint: Amphibians are small vertebrates that need water or a moist environment to survive. The species in this group includes frogs, toads, salamanders etc. The amphibians can breathe and absorb water through their very thin skin. Amphibians also have special skin glands that produce useful proteins. They are cold blooded vertebrates and do not have scales.

Complete answer
Heart of Amphibians:
It has three chambers – one ventricle and two atria.
Blood from the ventricle travels to the lungs and skin where it gets oxygenated .
In the ventricle oxygenated and deoxygenated blood are mixed before being pumped out of the heart .This method is inefficient as compared to mammalian heart.
     Why three chambered hearts?
The amphibians have lower metabolism. So they require less oxygen.
Because of the requirement of less oxygen the demand of high oxygen concentration decreases.
So a heart with three chambers is ideal for the amphibians. They can also absorb oxygen through the skin when moist.
The Amphibian has a three chambered heart that consists of two atria and one ventricle.

So, the correct answer is three.

Note: Mammals and birds have four chambered hearts with two atria and two ventricles in which the right ventricle pumps blood to the lungs while the left ventricle pumps blood to the rest of the body. They have four chambered hearts because of high metabolic rate as compared to amphibians.