Which feature does not characterize the circulatory system of water-breathing fishes?
A) Single atrium
B) Blood leaving the gills returning to the heart for additional pumping before entering the systemic circuit
C) Single ventricle
D) Blood leaving the gills and entering the aorta under low pressure
E) Single circuit

Question

Quizplus · Accepted Answer

In water-breathing fishes, the circulatory system is characterized by a single circuit where blood passes from the heart to the gills for oxygenation and then directly to the rest of the body. There is no return of blood to the heart for additional pumping before entering the systemic circuit as seen in the double circulatory systems of mammals and birds.

Which Feature Does Not Characterize the Circulatory System of Water-Breathing