Questions and Answers
What tissue lines all our bodies, both inside and out, and also forms glands?
Epithelial tissue
What are the two types of epithelial tissues?
Membranous epithelium, glandular epithelium
What type of epithelial tissue covers and lines the external surface of our body and all internal cavities, organs, tubes, and passageways?
Membranous epithelium
What type of epithelial tissue is specialized in producing and secreting substances such as sweat, stomach acids, mucus, and hormones?
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What are the five epithelial tissue characteristics?
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Cellularity means that the epithelium is entirely made up of what?
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What characteristic means that the cells look different from the top than from the bottom?
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What term refers to the base or bottom part of the epithelial cell that sits on the basement membrane?
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What term refers to the apex or top part of the cell which faces the lumen or the external body?
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What is the term for the special layer to which the basal surface of the epithelial cells is attached?
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What supports the epithelium and anchors it firmly to the underlying connective tissue?
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What characteristic of epithelial tissue describes its lack of blood supply?
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What does it mean when we say epithelial tissue is avascular?
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Because epithelial tissue is avascular, the tissue gets its nutrients by _ from _
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Where are the capillaries used in the diffusion of epithelial tissues found?
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What characteristic of epithelial tissue is important for healing cuts or bruises on the skin?
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What are the functions of epithelial tissue?
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What is an example of epithelial tissue?
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Epithelial tissue has a rich _ supply.
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Why is a large nerve supply within epithelial tissue important?
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Study Notes
Characteristics of Epithelial Tissue
- Epithelial tissue lines the body's surfaces, internally and externally, and forms glands.
- Two main types: membranous epithelium and glandular epithelium.
- Membranous epithelium covers external surfaces and lines internal cavities, organs, tubes, and passageways.
- Glandular epithelium is specialized for the production and secretion of substances like sweat, stomach acids, mucus, and hormones.
Key Characteristics
- Cellularity: Epithelial tissue consists entirely of cells.
- Polarity: Cells exhibit differences in structure and function between the apical (top) and basal (bottom) surfaces.
- Basal Surface: The part of the cell sitting on the basement membrane is known as the basal surface.
- Apical Surface: The part of the cell facing the lumen (e.g., intestine) or external body (e.g., skin) is the apical surface.
- Attachment: The basal surface is anchored to the underlying connective tissue via the basal lamina or basement membrane.
- Avascular: Epithelial tissue lacks its own blood supply and is nourished by diffusion from nearby capillaries.
Nutrient Supply
- Nutrients for epithelial tissue are obtained through diffusion from capillaries located in the underlying connective tissue.
Regeneration
- Epithelial tissue exhibits high regenerative capacity, which is crucial for repairing injuries like cuts or bruises.
Functions of Epithelial Tissue
- Provides protection against mechanical injury, pathogens, and chemical exposure.
- Controls permeability, facilitating selective absorption and secretion.
- Contains specialized cells that provide sensations, contributing to sensory perception.
- Produces secretions that serve various functions in the body.
Examples and Additional Facts
- An example of epithelial tissue is the skin.
- Epithelial tissue has a rich nerve supply, which is important for sensory functions and responses.
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Description
This quiz explores the fundamental characteristics of epithelial tissue, including its types, cellular structure, and polarity. Test your understanding of how epithelial tissue functions in the body, from covering surfaces to forming glands. Discover the crucial roles that both membranous and glandular epithelium play.
