The following questions refer to the figure above showing a fish gill filament.
-The least oxygenated water is indicated by
A) A.
B) B.
C) C.
D) D.
E) E.

Question

The following questions refer to the figure above showing a fish gill filament.
-The least oxygenated water is indicated by
A) A. 
B) B. 
C) C. 
D) D. 
E) E.

Quizplus · Accepted Answer

The arrows on the diagram indicate the direction of water flow over the gill filament, from left to right. Oxygen diffuses across the respiratory membrane from the more oxygenated water (in this case, on the left side) to the less oxygenated water (on the right side). Therefore, the least oxygenated water would be at the end of the gill filament where the arrow points, which is position B.

The Following Questions Refer to the Figure Above Showing a Fish