In the lungs, movement of dissolved carbon dioxide out of the capillaries occurs in one of two ways:
● by diffusion through the endothelial cells of the capillaries
● by leakage through pores in the endothelial cells of the capillaries.
What is the minimum number of times that a carbon dioxide molecule that has been transported to the lungs in a red blood cell must cross a cell surface membrane to reach an air space in an alveolus?
1 )
2
3
3 )
4
4 )
5
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