Which of the Following Would Be the Consequence If the Direction

Multiple Choice

Which of the following would be the consequence if the direction of water flow over the gills of a fish was reversed, moving water inward past the operculum, past the gills, then out the mouth?

A) the efficiency of gas exchange would be reduced
B) the efficiency of gas exchange would increase
C) the thickness of the blood would increase
D) the thickness of the blood would decrease