Epithelial tissues can be described anatomically. Simple or stratified; squamous, cuboidal or columnar. With these descriptions in mind, this is an image of what kind of epithelial tissue?

Question

BlackTom AI · Accepted Answer

The cells show nuclei staggered at different vertical levels while all cells appear to reach the basement membrane and the apical surface bears cilia—this combination is diagnostic of pseudostratified columnar epithelium.

1. Relevant knowledge points and concepts
- Epithelial classification uses two criteria: number of cell layers (simple vs stratified) and cell shape (squamous, cuboidal, columnar).  
- Pseudostratified epithelium is a special “simple” epithelium: all cells contact the basement membrane (one layer), but nuclei lie at varying heights, producing the illusion of multiple layers.  
- Respiratory-type pseudostratified columnar epithelium commonly has cilia and goblet (mucus-secreting) cells.

2. Step-by-step reasoning
- Observe cell height: cells are taller than they are wide, consistent with columnar shape.  
- Observe nuclear arrangement: nuclei are at different vertical positions rather than aligned in a single neat row—this suggests apparent stratification.  
- Observe apical surface: a dense brush/line of projections indicates cilia. Ciliated tall cells plus scattered pale goblet-like cells are typical of pseudostratified respiratory epithelium.  
- Confirm basal attachment: although some nuclei are low and some are high, the cells’ bases rest on the basement membrane (visible in the diagram/histology), indicating a single cell layer.

3. Intermediate “calculations” or checks
- Number of true layers = 1 (all cells contact basement membrane) → therefore it is simple (not truly stratified).  
- Cell shape = columnar (tall cells) → therefore columnar.  
- Appearance of multiple nuclear layers + cilia + goblet cells → pseudostratified columnar (respiratory epithelium).

4. Why the correct answer is correct
Pseudostratified columnar epithelial tissue fits every observed criterion: single-layer organization with nuclei at varying heights, columnar cell shape, apical cilia, and mucous cells—exactly what the images depict.

5. Why other options are incorrect
- Stratified cuboidal: would show multiple true layers of cube-shaped cells (not tall columnar cells).  
- Simple squamous: would be a single layer of flat, plate-like cells (not tall, ciliated cells).  
- Simple columnar: has aligned nuclei at a single level (not staggered) and lacks the “pseudo” stratified appearance.  
- Stratified squamous: has multiple layers with superficial flattened cells (not ciliated columnar cells).

6. Conclusion
All observations confirm the epithelium is pseudostratified columnar, matching the provided correct answer: e. Pseudostratified columnar.

Epithelial tissues can be described anatomically. Simple or stratified; squamous, cuboidal or columnar. With these descriptions in mind, this is an image of what kind of epithelial tissue?单项选择题

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