Goblet cells are

Options

A. unicellular glands
B. multicellular glands
C. dead keratinised cells
D. stratified epithelium

Answer

**Step-by-Step Solution:**

1. **Definition of Goblet Cells**: Goblet cells are specialized epithelial cells that are primarily responsible for the secretion of mucus. They are found in various mucous membranes throughout the body.

2. **Classification**: Goblet cells are classified as unicellular glands. This means that they consist of a single cell that performs the function of secretion.

3. **Function**: As exocrine glands, goblet cells secrete mucus directly into the lumen of organs or onto epithelial surfaces. This secretion plays a crucial role in lubrication and protection of the epithelial tissues.

4. **Epithelial Type**: Goblet cells are typically found within simple columnar epithelium, which is a type of epithelial tissue characterized by a single layer of tall, column-like cells.

5. **Evaluation of Options**:
- **Option 1: Unicellular gland** - This is correct as goblet cells are indeed unicellular glands.
- **Option 2: Multicellular gland** - This is incorrect because goblet cells do not form multicellular structures.
- **Option 3: Dead keratinized cells** - This is incorrect as goblet cells are not keratinized and are living cells.
- **Option 4: Stratified epithelium** - This is incorrect because goblet cells are not found in stratified epithelium; they are found in simple columnar epithelium.

6. **Conclusion**: The correct answer to the question "Goblet cells are" is that they are unicellular glands.