Oxygen passes from the alveoli to red blood cells by dissolving in the lining fluid, diffusing through the thin alveolar and red blood cell membranes, and loading onto hemoglobin to maintain a steep concentration gradient.
Oxygen passes from the alveoli to red blood cells by dissolving in the lining fluid, diffusing through the thin alveolar and red blood cell membranes, and loading onto hemoglobin to maintain a steep concentration gradient.
| Front | Describe the mechanism by which oxygen passes from the alveolar space into the red blood cell ( 4 marks) |
|---|---|
| Back | dissolves in fluid (lining the alveolus); diffusion through membrane (to red cell); thin wall so short gradient; concentration gradient maintained by inspiration and blood flow; much oxygen loaded onto haemoglobin; which makes oxygen gradient even steeper; |
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