Identify functions of airway mucus in the normal lung. 1. Increased mucus production decreases bronchospasm. 2. Protect the airways from excessive water loss. 3. Shield the airway from toxic particles. 4. Trap inhaled contaminants
a. 1, 2, and 3 only
b. 2, 3, and 4 only
c. 1 and 4 only
d. 3 and 4 only
ANS: B
Mucus functions to protect the underlying tissue. It helps to prevent excessive amounts of water from moving into and out of the epithelia. It shields the epithelia from direct contact with poten-tially toxic materials and microorganisms. It acts like sticky flypaper to trap particles that make contact with it. This makes mucus an important part of the pulmonary defenses.
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