Question
Which of the following is the main component of surfactant, secreted by alveolar epithelial cells?
| A. |
Proteins
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| B. |
Phospholipids
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| C. |
Lipoproteins
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| D. |
One of the above
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Show Answer
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Correct Answer � B
Explanation
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Ans. B. Phospholipids
- Nearly 77% of the surfactant is composed of phospholipids.
- A phospholipid is made up of two fatty acid tails and a phosphate group head.
- Fatty acids are long chains that are mostly made up of hydrogen and carbon, while phosphate groups consist of a phosphorus molecule with four oxygen molecules attached.
- These two components of the phospholipid are connected via a third molecule, glycerol.
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