The mucus seen in chronic bronchitis patient is derived from which of the following cell types?
**Core Concept**
The mucus in chronic bronchitis is produced by mucous cells in the respiratory epithelium, playing a key role in trapping pathogens and debris. This mucus production is often excessive in chronic bronchitis due to inflammation and infection.
**Why the Correct Answer is Right**
The correct answer is goblet cells. Goblet cells are specialized mucous cells found in the respiratory epithelium that produce and secrete mucin, the main component of mucus. In chronic bronchitis, goblet cells are hyperplastic, leading to an overproduction of mucus, which contributes to airway obstruction and decreased lung function. The mucin produced by goblet cells is rich in water and electrolytes, making it an effective trap for pathogens and debris.
**Why Each Wrong Option is Incorrect**
**Option A:** Ciliated cells are responsible for moving mucus out of the airways through ciliary action, but they do not produce mucus.
**Option B:** Basal cells are stem cells that give rise to both ciliated and mucous cells, but they do not produce mucus themselves.
**Option D:** None of the other options are correct, as they do not accurately describe the cell type responsible for mucus production in the respiratory epithelium.
**Clinical Pearl / High-Yield Fact**
In chronic bronchitis, the overproduction of mucus by goblet cells contributes to airway obstruction and decreased lung function. This can be a target for therapeutic interventions, such as mucolytic agents that break down mucus, making it easier to clear.
**Correct Answer:** C. Goblet cells.