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Certain epithelial cells are called pseu...

Certain epithelial cells are called pseudostratified columnar epithelium because :

A

they have a layered appearance but all the cells contact the basement membrane

B

they are stratified and all the cells do not contact the basement membrane

C

their muclei are all located the same distance from the cell surface

D

they are a mixture of cell types

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Term "Pseudostratified":** - The term "pseudostratified" means "false stratified." It indicates that while the epithelium appears to be layered, it is not truly stratified. 2. **Structure of Pseudostratified Columnar Epithelium:** - Pseudostratified columnar epithelium consists of a single layer of cells. However, these cells vary in height, which gives the illusion of multiple layers. 3. **Nuclear Arrangement:** - In pseudostratified columnar epithelium, the nuclei of the cells are located at different levels within the tissue. This variation in nuclear position contributes to the appearance of stratification. 4. **Connection to Basement Membrane:** - All cells in pseudostratified columnar epithelium rest on the basement membrane. This is a key characteristic that confirms it is a single-layered epithelium, as opposed to true stratified epithelium where cells would be stacked on top of one another. 5. **Conclusion:** - Therefore, pseudostratified columnar epithelium is called so because it has a layered appearance due to the varying cell heights and nuclear positions, but fundamentally, it is a single layer of cells that all contact the basement membrane. ### Final Answer: Certain epithelial cells are called pseudostratified columnar epithelium because they have a layered appearance but all the cells contact the basement membrane.
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