Which of the following is an example of unicellular glandular cells?

Options

A. Cells of salivary gland
B. Goblet cells alimentary canal
C. Cells of inner lining of ducts of salivary glands
D. Cells on the moist surface of buccal cavity

Answer

To determine which of the following is an example of unicellular glandular cells, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Unicellular Glandular Cells**:
- Unicellular glandular cells are single cells that have the ability to secrete substances. A common example of this type of cell is the goblet cell, which secretes mucus.

2. **Analyzing the Options**:
- **Option 1: Cells of Salivary Glands**:
- These are multicellular structures, specifically composed of clusters of cells that work together to produce saliva. Therefore, this option is incorrect.

- **Option 2: Goblet Cells in the Elementary Canal**:
- Goblet cells are indeed unicellular glandular cells found in the lining of the intestines and respiratory tract. They are responsible for secreting mucus, making this option a strong candidate.

- **Option 3: Cells of Inner Lining of Duct of Salivary Glands**:
- The inner lining of these ducts is made up of compound epithelium, which consists of multiple layers of cells. Thus, this option is also incorrect.

- **Option 4: Cells on the Moist Surface of Buccal Cavity**:
- The cells in the buccal cavity are primarily cuboidal epithelial cells and do not function as unicellular glands. Therefore, this option is incorrect as well.

3. **Conclusion**:
- After analyzing all options, the only example of unicellular glandular cells is **Option 2: Goblet Cells in the Elementary Canal**.

### Final Answer:
**Option 2: Goblet Cells in the Elementary Canal**