Which one of the following animals has a three-chambered heart?

Scoliodon

Salamander

Pigeon

Human being

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CDS-1 – 2020

Download PDF Attempt Online

Salamanders are amphibians. Most amphibians have a three-chambered heart consisting of two atria and one ventricle. This contrasts with fish (Scoliodon), which have a two-chambered heart, and birds (Pigeon) and mammals (Human being), which have a four-chambered heart.

– Scoliodon (fish) has a two-chambered heart.
– Salamander (amphibian) has a three-chambered heart.
– Pigeon (bird) has a four-chambered heart.
– Human being (mammal) has a four-chambered heart.

The evolution of the heart chambers reflects adaptations for more efficient circulation. Two-chambered hearts pump deoxygenated blood to the gills for oxygenation. Three-chambered hearts allow for some mixing of oxygenated and deoxygenated blood in the single ventricle before pumping it to both the lungs and the body. Four-chambered hearts completely separate oxygenated and deoxygenated blood, allowing for more efficient oxygen delivery, which is necessary for the high metabolic rates of birds and mammals.

Join Our Telegram Channel

More similar MCQ questions for Exam preparation:-