A surfactant is a secretory product that is composed of:
Correct answer: B. Protein and lipid
- A. Protein and disaccharide
- B. Protein and lipid
- C. Lipid and carbohydrate
- D. Carbohydrate and vitamins
Explanation
Surfactant is an agent that decreases the surface tension between two media. The surface tension between gaseous-aqueous interphase in the lungs is decreased by the presence of a thin layer of fluid known as pulmonary surfactant. It is composed of lipids and proteins.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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