Biology for IGCSE & O level - Gas Exchange In Humans (Section 1 - No. 16)
In the context of gas exchange, what is the primary function of the capillaries?
To provide structural support for the alveoli.
To transport oxygen and carbon dioxide to and from the alveoli.
To filter out pathogens from the air.
To produce surfactant to reduce surface tension.
Explanation
Capillaries are small blood vessels that facilitate the exchange of gases between the blood and the alveoli.
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