As compared with the circulatory system of most fishes, the circulatory system of adult amphibians has the advantage of
A) a four-chambered heart.
B) two aortas.
C) a partial separation between pulmonary and systemic circulation.
D) a pocket of the gut that serves as an air bladder.
E) complete separation of oxygenated and deoxygenated blood.

Question

Quizplus · Accepted Answer

Most fishes have a single circuit circulatory system, where all the blood is pumped by a two-chambered heart. Adult amphibians have a three-chambered heart and a partial separation between pulmonary and systemic circulation. This helps in better oxygenation of blood, as the oxygenated and deoxygenated blood are partially separated.

As Compared with the Circulatory System of Most Fishes, the Circulatory