A good gas exchange system maintains a steep diffusion gradient, has a large total surface area and a short diffusion distance.
Which feature of the human gas exchange system helps to maintain a steep diffusion gradient?
1 )
A large number of alveoli are present in each lung.
2 )
Alveoli walls contain elastic fibres allowing expansion.
The air brought into the alveoli by ventilation is high in oxygen.
4 )
The endothelium of the capillary wall is made of flattened cells.
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