Which of the following examples illustrates the process of countercurrent exchange?
A) flow of water across the gills of a fish and the blood within those gills
B) flow of blood in the dorsal vessel of an insect and that of air within its tracheae
C) flow of air within the primary bronchi of a human and the blood within the pulmonary veins
D) flow of water across the skin of a frog and the blood flow within the ventricle of its heart

Question

Quizplus · Accepted Answer

Countercurrent exchange is a mechanism that enables the exchange of substances or heat between two fluids flowing in opposite directions to maximize transfer efficiency. In fish, water flows across the gills in one direction while blood flows in the opposite direction within those gills, allowing for efficient gas exchange. This is a classic example of countercurrent exchange.

Which of the Following Examples Illustrates the Process of Countercurrent