The passageways of the respiratory system have mucous secreting cells called:
Correct answer: B. Goblet cells
- A. Tracheal cells
- B. Goblet cells
- C. Surfactant cells
- D. Pleural cells
Explanation
The primary function of goblet cells is to synthesize and secrete mucus. Pleural cells line the pleural cavity which has nothing to do with the respiratory passageway. Surfactant cells line the alveoli that release a key component, surfactant, whose main function is to reduce surface tension. Tracheal cells are of two types goblet cells and ciliated cells. Tracheal cells are not specifically mucous secreting cells but involve ciliated cells too.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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