In vertebrate animals, functional separation of deoxygenated and oxygenated blood
A) is called countercurrent circulation.
B) enhances the efficiency of gas exchange.
C) allows stronger contractions of the heart.
D) allows gas exchange by diffusion.
E) is advantageous when air-breathing vertebrates are submerged.

Question

Quizplus · Accepted Answer

The functional separation of deoxygenated and oxygenated blood enhances the efficiency of gas exchange by ensuring that oxygen-rich blood is delivered to the body tissues and oxygen-poor blood is sent to the lungs or gills for reoxygenation. This separation is a key feature of the circulatory systems of many vertebrates, particularly those with a double circulatory system, such as mammals and birds, allowing for more efficient oxygen delivery and carbon dioxide removal.

In Vertebrate Animals, Functional Separation of Deoxygenated and Oxygenated Blood