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

Question

Quizplus · Accepted Answer

Adult amphibians have a partial separation between pulmonary and systemic circulation, allowing for more efficient oxygen exchange. Most fishes have a single-loop circulatory system where blood is pumped through the gills, to the body, and then back to the heart. In contrast, adult amphibians have a three-chambered heart (with the exception of crocodilians which have four chambers) and a partial separation between pulmonary and systemic circulation. This means that some oxygenated blood can be delivered directly to the body tissues, bypassing the lungs, leading to increased efficiency in oxygen exchange.

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