Question at position 8 An epithelial tissue that is multiple layers thick and has cells with a flattened appearance is calledsimple squamoussimple cuboidalsimple transitionalstratified squamous单项选择题
A
simple squamous
B
simple cuboidal
C
simple transitional
D
stratified squamous

Question

Question at position 8 An epithelial tissue that is multiple layers thick and has cells with a flattened appearance is calledsimple squamoussimple cuboidalsimple transitionalstratified squamous

BlackTom AI · Accepted Answer

Epithelial tissues are classified by two criteria: the number of cell layers and the shape of the apical (surface) cells. "Multiple layers" indicates a stratified epithelium; "flattened appearance" describes squamous cells.

1. Relevant knowledge points and concepts
- "Simple" epithelia have a single cell layer; "stratified" epithelia have two or more layers.
- Cell shapes at the apical surface: squamous (flat, plate-like), cuboidal (roughly cube-shaped), columnar (tall), and transitional (specialized, dome-shaped when relaxed, can stretch).
- Common examples: stratified squamous epithelium lines skin (keratinized) and oral cavity/esophagus (non-keratinized).

2. Step-by-step reasoning
- The stem states the tissue is "multiple layers thick" → that excludes any "simple" epithelium (simple = single layer).
- The cells have a "flattened appearance" → this identifies the squamous cell shape.
- Combine the two descriptors: multiple layers + flattened apical cells = stratified squamous epithelium.

3. Calculations/intermediate steps
- No numerical calculations are needed. The logical intermediate steps are: categorize by layers (simple vs stratified) → select stratified; categorize by apical shape (squamous vs cuboidal vs transitional) → select squamous.

4. Why the correct answer is correct
- Stratified squamous fits both criteria simultaneously: stratified = multiple layers; squamous = flattened apical cells. This epithelial type is specialized for protection where abrasion occurs (e.g., skin, mouth, esophagus).

5. Why the other options are incorrect
- Simple squamous: cells are flattened, but "simple" means a single layer, contradicting "multiple layers thick."
- Simple cuboidal: "simple" (single layer) and "cuboidal" (cube-shaped cells), neither matches the given descriptors.
- Simple transitional: transitional epithelium is typically stratified and specialized for stretch (and is not described as simply flattened apical cells in the same sense); also "simple transitional" is not a correct pairing because transitional epithelia are stratified by definition.

Conclusion: The correct answer is stratified squamous, which matches the provided answer.

Question at position 8 An epithelial tissue that is multiple layers thick and has cells with a flattened appearance is calledsimple squamoussimple cuboidalsimple transitionalstratified squamous单项选择题

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