Biology for IGCSE & O level - Gas Exchange In Humans (Section 3 - No. 47)
What is the role of mucus in the respiratory system?
To facilitate gas exchange.
To trap pathogens and debris.
To provide structural support to the alveoli.
To reduce surface tension in the lungs.
Explanation
Mucus traps inhaled particles, such as dust and pathogens, preventing them from reaching the alveoli.
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