Which of the following statements comparing respiration in fish and in mammals is correct?

Question

Quizplus · Accepted Answer

In fish, the movement of the respiratory medium (water) is unidirectional, meaning it moves in one direction over the gills. In mammals, the movement of the respiratory medium (air) is bidirectional, meaning it moves in and out of the lungs. All of the other statements are incorrect. Oxygen levels in the respiratory medium are similar in fish and mammals, countercurrent exchange mechanisms are present in fish gills and mammalian lungs, both fish and mammals primarily transport oxygen using red blood cells, and both fish and mammals have cells that are exposed to the respiratory medium for gas exchange (in fish, these are the gills, in mammals, these are the alveoli in the lungs).

Which of the Following Statements Comparing Respiration in Fish and in Mammals