Biology for IGCSE & O level - Gas Exchange In Humans (Section 2 - No. 3)
What is the main purpose of the mucus produced in the respiratory tract?
To prevent the lungs from collapsing.
To transport oxygen to the blood.
To trap inhaled particles and pathogens.
To reduce surface tension in the alveoli.
Explanation
Mucus traps dust particles, bacteria, and other foreign substances to prevent them from entering the lungs.
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