Which of the following adaptations is not seen in fish gills? A) A countercurrent exchange system B) Bidirectional ventilation of the gills C) Morphological features that increase the surface area available for gas exchange D) Morphological features that decrease the path length for diffusion of the respiratory gases E) Morphological features that maximize the efficiency of O₂ extraction

Question

Quizplus · Accepted Answer

Fish gills use unidirectional ventilation, meaning water flows in one direction over the gills, allowing for efficient oxygen uptake and carbon dioxide excretion. Bidirectional ventilation would not be as efficient and could potentially result in the reabsorption of carbon dioxide.

Which of the Following Adaptations Is Not Seen in Fish