Which statement about gas exchange between air in the alveoli and blood in the pulmonary capillaries is correct?
1 )
The oxygen concentration in the capillaries leaving the pulmonary artery is higher than the oxygen concentration in the alveoli.
2 )
Gases must diffuse across the endothelium of the pulmonary capillaries and the endothelium of the alveoli.
The elastic fibres in the alveoli walls allow the alveoli to expand to increase the surface area available for diffusion into the pulmonary capillaries.
4 )
Breathing out reduces the carbon dioxide concentration gradient between the blood in the pulmonary capillaries and the air in the alveoli.
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