In which animal is a crosscurrent flow system used for air exchange?
A)Birds
B)Lizards
C)Fish
D)Mammals
E)Whales

Question

Quizplus · Accepted Answer

Birds use a crosscurrent flow system for air exchange in their lungs. Air flows in one direction through the lungs, perpendicular to the flow of blood, allowing for more efficient gas exchange. This is different from the tidal flow system used in mammals, where air flows in and out of the lungs through the same pathway. Lizards and fish also have different respiratory systems, while it is not clear whether whales use crosscurrent flow or tidal flow.

In Which Animal Is a Crosscurrent Flow System Used for Air