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Questions and Answers
Which embryonic layers can give rise to epithelial tissue?
Which embryonic layers can give rise to epithelial tissue?
Epithelial tissue is vascular tissue.
Epithelial tissue is vascular tissue.
False
How does epithelial tissue receive nutrition?
How does epithelial tissue receive nutrition?
By diffusion from the underlying connective tissue.
What type of epithelium consists of numerous crowded cells with minimal intercellular substance?
What type of epithelium consists of numerous crowded cells with minimal intercellular substance?
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What is myoepithelium known for?
What is myoepithelium known for?
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Which of the following is NOT a type of surface epithelium?
Which of the following is NOT a type of surface epithelium?
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The basement membrane is the layer where epithelial cells rest on.
The basement membrane is the layer where epithelial cells rest on.
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Which tissue type secretes mucus and contains goblet cells?
Which tissue type secretes mucus and contains goblet cells?
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What are the classifications of epithelial tissue?
What are the classifications of epithelial tissue?
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What is the main function of simple cubical epithelium?
What is the main function of simple cubical epithelium?
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Study Notes
Epithelial Tissue
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Epithelial tissue covers surfaces or lines cavities throughout the body.
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Develops from ectoderm, mesoderm, or endoderm.
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Rests on a basement membrane (B.M.).
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Avascular, meaning it does not contain blood vessels.
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Receives nutrition through diffusion from the underlying connective tissue.
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Consists of numerous crowded cells with minimal intercellular substance forming continuous sheets.
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Can be modified to produce secretions (glandular epithelium), receive sensation (neuroepithelium), or acquire contractile function (myoepithelium)
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Can regenerate quickly.
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Classified into:
- Surface epithelium
- Glandular epithelium
- Neuroepithelium
- Myoepithelium
Surface Epithelium
- Classified based on the number of layers:
- Simple epithelium: one layer of cells.
- Stratified epithelium: multiple layers of cells.
- Further classified by cell shape within the layer:
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Simple Squamous Epithelium:
- Flat, thin cells with a flat nucleus.
- Functions for easy movement, gas and fluid exchange due to its thin surface.
- Found: mesothelium (pleura, pericardium, peritoneum), endothelium (heart and blood vessels), lung alveoli, Bowman's capsule of kidney.
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Simple Cubical Epithelium:
- Cube-like cells with a central, rounded nucleus.
- Functions for secretion and reabsorption.
- Found: thyroid follicle, small ducts of salivary glands, renal convoluted tubules.
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Simple Columnar Epithelium
- Tall cells with an oval, basal nucleus.
- Functions for secretion and absorption (microvilli, e.g. intestine).
- Found: stomach, intestine, goblet cells (secrete mucus), uterus, fallopian tubes
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Simple Columnar Ciliated Epithelium
- Tall cells with cilia, basal, oval nucleus.
- Functions for movement of particles or fluids over the surface.
- Found: lung bronchioles, uterus, fallopian tubes.
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Pseudostratified Columnar Epithelium:
- Single layer of cells, but nuclei appear at different levels, giving a stratified appearance.
- Can be ciliated or non-ciliated, with or without goblet cells.
- Found: male genital system (non-ciliated), respiratory epithelium (ciliated), epididymis (ciliated).
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