Question
SLPaper 1A
The diagram shows red blood cells and undifferentiated tissue cells.
Diffusion of oxygen from blood cells to tissue cells is represented by arrow 3 in the diagram. What molecules are shown diffusing by arrow 1 and arrow 2?
| Arrow 1 | Arrow 2 | |
|---|---|---|
| A. | carbon dioxide | urea |
| B. | water | glucose |
| C. | glucose | carbon dioxide |
| D. | fatty acids | amino acids |
