alleryStart learning →Pulmonary surfactant is composed of which materials?
APhospholipids and proteins
BGlycogen and cholesterol
CMucin and lysozyme
DElastin and collagen
Answer & Solution
Correct answer: A. Phospholipids and proteins
1. Surfactant is the secretion that lowers alveolar surface tension.
2. It is composed of phospholipids and proteins.
3. So the first option is correct.
4. Mucin and lysozyme are secretions of the upper airway lining rather than components of surfactant.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_
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