Pseudostratified columnar epithelium is found in

Options

A. Mouth
B. Stomach/Oesophagus
C. Kidney
D. Trachea/ Bronchi/Bronchiole/Nasal cavity.

Answer

**Step-by-Step Solution:**

1. **Understanding Pseudostratified Columnar Epithelium**:
- Pseudostratified columnar epithelium is a type of epithelial tissue that appears to be stratified (having multiple layers) but is actually a single layer of cells with varying heights. This gives the illusion of multiple layers.

2. **Analyzing the Options**:
- **Option 1: Mouth**: The epithelium in the mouth is stratified squamous epithelium, which is not pseudostratified. Therefore, this option is incorrect.
- **Option 2: Stomach or Esophagus**: The stomach and esophagus are lined with simple columnar epithelium, which serves to protect against gastric juices. This option is also incorrect.
- **Option 3: Kidney**: The kidney is lined with simple cuboidal epithelium, which is involved in absorption and secretion. This option is incorrect as well.
- **Option 4: Trachea or Bronchi or Nasal Cavity**: These structures are lined with pseudostratified columnar epithelium, which is ciliated and helps in the movement of mucus and trapped particles out of the airways. This option is correct.

3. **Conclusion**:
- The correct answer to the question "Pseudostratified columnar epithelium is found in" is **Option 4: Trachea or Bronchi or Nasal Cavity**.

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