Question

In an amphibian, the heart has:

• A. Two atria and two ventricles
• B. Two atria and one ventricle
• C. One atrium and two ventricles
• D. One atrium and one ventricle

Answer 1

Answer: (B)

Two atria and one ventricle

In the amphibian heart, there are 2 atria and one ventricle. The right atrium receives deoxygenated blood and the left atrium receives oxygenated blood. When the atria contract, the left and right atrium empty their blood into the ventricle. Next the ventricle contracts and pumps the blood into one large blood vessel, which divides into smaller blood vessels in the amphibian's body. Some of the blood mixes together.