Question

Salamander has a ___ heart.
A. 2 chambered
B. 3 chambered
C. 4 chambered
D. 1 chambered

Answer 1

Hint: The amphibians gave the ability to absorb oxygen through their skin. This puts less load on the heart in order to absorb the desired amount of oxygen. So, their heart is less developed.
Complete answer
Salamanders belong to the group of amphibians which are typically characterized by a lizard-like appearance. They have slender bodies, blunt snouts, short limbs which project at right angles to the body, and a tail in both larvae as well as the adult stage. Group Amphibia shows 3 chambered heart - two auricles and one ventricle. In the 3 chambered heart, there is partial mixing of oxygenated and deoxygenated blood.
Additional Information:
Heart of the vertebrates can be categorized by the number of chambers they have:
- Two chambers: It is divided into one atrium and one ventricle and is found in fishes.
- Three chambers: It is divided into two atria and one ventricle and is found in amphibians and reptiles.
- Four chambers: It is divided into two atria and two ventricles and is seen in birds and mammals.
So, the correct answer is 3 chambered.
Note: Amphibians along with the reptiles have a three-chambered heart. Oxygenated blood returns to the heart from the lungs via pulmonary vein which then passes into the left atrium. The deoxygenated blood returns from the body through the sinus venosus and passes into the right atrium. The heart is important in all organisms as it pumps blood to the entire body and delivers oxygen and nutrients to the cells and removes all the waste products.