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Biology: Epithelial Tissue Features
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Biology: Epithelial Tissue Features

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Questions and Answers

What is the characteristic of epithelial tissue in terms of intercellular space?

  • No intercellular space
  • Wide intercellular space
  • Variable intercellular space
  • Very little intercellular space (20 nm) (correct)
  • How do epithelial cells receive nourishment?

  • Through blood vessels
  • Through direct ingestion
  • Through lymphatic vessels
  • By diffusion from adjacent supporting tissue (correct)
  • What is the characteristic of epithelial cells in terms of polarity?

  • They are non-polar
  • They show only apical polarity
  • They show polarity (correct)
  • They show only basal polarity
  • What is the characteristic of epithelial tissue in terms of regenerative capacity?

    <p>It has a good regenerative capacity</p> Signup and view all the answers

    What are the two main types of epithelia?

    <p>Covering and secretory epithelia</p> Signup and view all the answers

    What is the characteristic of simple squamous epithelia?

    <p>Cells are thin and flattened</p> Signup and view all the answers

    What is the function of simple cuboidal epithelia?

    <p>Mainly concerned with secretory, absorptive, and excretory functions</p> Signup and view all the answers

    What is the characteristic of simple columnar epithelia?

    <p>Cells have a high height and low width</p> Signup and view all the answers

    Study Notes

    General Features of Epithelial Tissue

    • Intercellular space is very limited, approximately 20 nm.
    • Epithelial tissue is usually avascular, and cells receive nourishment through diffusion from adjacent supporting tissue.
    • Cells rest on a basement membrane.
    • Cells exhibit polarity and surface modifications.
    • Epithelial tissue has a good regenerative capacity, and metaplasia (change from one type to another) can occur.
    • Epithelial tissue is derived from all three germ layers.

    Types of Epithelia

    • Epithelial tissue can be divided into two main types: covering (lining) epithelia and secretory (glandular) epithelia.

    Covering Epithelia

    • Classified into two categories based on the number of cell layers and cell morphology in the outer layer: simple epithelia and stratified epithelia.
    • Simple epithelia consist of a single cell layer resting on the basement membrane.
    • Stratified epithelia consist of two or more cell layers, with the basal layer resting on the basement membrane.

    Types of Simple Epithelia

    • Classified into three categories based on cell shape:

    Simple Squamous Epithelia

    • Composed of a single layer of flattened cells.
    • Cell height is very little compared to cell width.
    • Nuclei are oval and centrally located.
    • Functions: facilitates rapid transport of substances, diffusion of gases, and filtration of fluids.
    • Examples: Alveoli of the lungs, endothelium lining blood vessels.

    Simple Cuboidal Epithelia

    • Cells have approximately equal height and width.
    • Nuclei are usually rounded and centrally placed.
    • Functions: primarily concerned with secretory, absorptive, and excretory functions.
    • Examples: Thyroid gland follicles, ducts of large glands.

    Simple Columnar Epithelia

    • Cells are taller than they are wide.
    • Nuclei are elongated and located in the lower half of the cells.
    • In some cases, the cell surface bears cilia.
    • Examples: Lining epithelium of the fallopian tube.

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    Description

    This quiz covers the general features of epithelial tissue, including its structure, properties, and types. Learn about the characteristics of epithelial tissue and its functions in the human body.

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