Many organs have adaptations to increase the rate of diffusion of a gas or solute.How are fish gills adapted to optimize oxygen absorption?
A)Bidirectional flow of water across the gills
B)Co-current flow of water across the gills and blood within the gill capillaries
C)Continual flow of water across the gills
D)Countercurrent flow of water across the gills and blood within the gill capillaries

Question

Quizplus · Accepted Answer

Fish gills are adapted for optimum oxygen absorption through countercurrent exchange. In this process, water flows over the gills in the opposite direction to the flow of blood within the gill capillaries. This maximizes the diffusion gradient for oxygen, enabling a more efficient exchange of gases between the water and the fish's circulatory system. The countercurrent flow allows for a greater concentration gradient of oxygen between the water and the blood, resulting in higher rates of oxygen uptake.

Many Organs Have Adaptations to Increase the Rate of Diffusion