Questions: All cells in epithelium reach the basement membrane, but only cells that reach the free surface have cilia.

All cells in epithelium reach the basement membrane, but only cells that reach the free surface have cilia.
Transcript text: All cells in $\qquad$ epithelium reach the basement membrane, but only cells that reach the free surface have cilia.
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Solution

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The answer is the first one: pseudostratified columnar.

Explanation for each option:

  1. Pseudostratified columnar: This type of epithelium appears to be stratified (layered) because the nuclei are at different levels, but in reality, all cells reach the basement membrane. However, not all cells reach the free surface. The cells that do reach the free surface often have cilia. This matches the description given in the question.

  2. Simple columnar: In this type of epithelium, all cells reach both the basement membrane and the free surface. Therefore, it does not fit the description provided in the question.

  3. Stratified columnar: This type of epithelium has multiple layers of cells, and not all cells reach the basement membrane. This does not match the description given in the question.

  4. Stratified cuboidal: Similar to stratified columnar, this type of epithelium has multiple layers, and not all cells reach the basement membrane. This does not fit the description provided in the question.

  5. Stratified squamous: This type of epithelium also has multiple layers, and not all cells reach the basement membrane. This does not match the description given in the question.

Summary: The correct answer is pseudostratified columnar epithelium, as it is the only type where all cells reach the basement membrane, but only some reach the free surface and have cilia.

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