Epithelial tissues present all of the following characteristics EXCEPT for one: which one?

Question

BlackTom AI · Accepted Answer

Epithelial tissues are characterized by high cellularity and very little extracellular matrix, so "Large volumes of extracellular matrix" is the exception.

1) Relevant knowledge points and concepts
- Cellularity: Epithelia consist of closely packed cells with minimal intercellular space.
- Polarity: Epithelial cells have distinct apical (often exposed to lumen or outside) and basal surfaces.
- Regeneration: Many epithelia have a high mitotic rate and can rapidly regenerate.
- Innervation and vascularity: Epithelia are generally avascular (no blood vessels) but are often innervated—sensory nerve endings supply sensation.
- Basement membrane: A thin layer of specialized extracellular matrix (basal lamina) underlies epithelia, but it is small compared with connective tissue ECM.

2) Step-by-step reasoning
- Option "High density of cells": matches cellularity—epithelia are tightly packed, so this is a true characteristic.
- Option "Capacity to regenerate": epithelial stem or basal cells replenish surface cells frequently (e.g., epidermis, intestinal lining), so this is true.
- Option "A side that is exposed to the outside world": epithelial polarity includes an apical surface facing external environment or lumen; this is accurate.
- Option "Presence of nerve fibers for sensation": although avascular, many epithelial tissues have nerve endings for sensation (taste buds, skin epidermis has sensory receptors in close association), so this is true.
- Option "Large volumes of extracellular matrix": epithelia have only a thin basement membrane (small ECM); they do not contain large ECM volumes—this contradicts epithelial structure.

3) Intermediate details (no numeric calculations)
- Emphasize that the basement membrane is present but thin; in contrast, connective tissues have abundant ECM. The presence of a thin ECM does not justify "large volumes."

4) Why the correct answer is correct
- "Large volumes of extracellular matrix" conflicts directly with the defining feature of epithelia (high cellularity and minimal ECM). Therefore it is the exception.

5) Why the other options are incorrect choices for "EXCEPT"
- They are actually correct characteristics of epithelia: high cell density, regenerative capacity, apical exposure, and innervation for sensation are all consistent with epithelial tissue properties.

6) Conclusion
- The statement that is NOT characteristic of epithelial tissues is "Large volumes of extracellular matrix," which matches the provided correct answer.

Epithelial tissues present all of the following characteristics EXCEPT for one: which one?单项选择题

类似问题

Which of the following tissues is avascular (lacks blood vessels)?

Question at position 9 The free surface of an epithelial tissue is called the _______________ surface.basementapical

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

Which tissue type lines most of the digestive tract?

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?

What is the BEST name for an epithelium that is one layer of flat cells (i.e., width of cells is greater than the height) that lines blood vessels?

This tissue lines the stomach.

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单