Question

Which of the following has a 3-chambered heart?

• A. Salamander
• B. Fish
• C. Crocodile
• D. Dolphin

Answer 1

Answer: (A)

Vertebrates have evolved a muscular heart to pump blood to body parts. Fishes have a two-chambered heart. Birds and mammals have four-chambered hearts, having two atria and two ventricles. Reptiles, except crocodile, have a three-chambered heart. Crocodiles have a four-chambered heart. Thus Dolphin being a mammal has a four-chambered heart. Salamander being an amphibian has a three-chambered heart.