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Epithelial tissues
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Epithelial functions 1) Protection: covers body and lines all body cavities; provides a protective shield for underlying tissues (e.g. epidermis) 2) Absorption: in some parts of the body it takes in certain materials (e.g. digestive tract) 3) Secretion: in some parts of the body epi. tissue is specialized to secrete certain products E.g. small intestine: some cells are specialized to secrete mucus 4) Excretion: in the kidney cells rid the body of materials 5) Surface transport: cilia on cells move mucus and particles up and out 6) Sensory functions: Ex. taste buds in the mouth
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Cell shapes 1) squamous: square cells that are thin and flat 2) cuboidal: small cubes in cross section 3) columnar: tiny columns
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Layers 1) simple: one layer of cells 2) stratified: cells arranged in two or more layers 3) pseudostratified: falsely appear to be layered
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Epithelial tissues Cover all body surfaces, and body organs
Epithelial tissues are avascular ET have a free surface, exposed to the outside of the structure Under side have a basement membrane, always near connective tissue, connective tissues are very vascular Cancers of epithelial tissues are called carcinomas
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Simple Squamous Epithelium
Location: Alveoli of lungs, walls of capillaries, and linings of blood vessels Function: Diffusion, filtration, and osmosis
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Simple Squamous 1000X
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Simple Squamous
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Simple squamous 400X Alveoli of lungs
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Our slides
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Simple Cuboidal epithelium
Location: surface of ovaries, linings of kidney tubules, and various other glands Function:Secretion and absorption
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Simple Cuboidal 400X
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More simple cuboidal 400X
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Simple cuboidal 400X
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Our slides
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Simple Columnar Epithelium
Location: lining of digestive tract, lining of uterus Function:Protection, secretion, and absorption Goblet cells often present- Secrete mucus
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Simple Columnar 400x
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Simple columnar with Goblet cells 400x
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Psuedostratified Columnar Epithelium
Location: Lining of respiratory tract, and lining of various tubes of reproductive tract. Function: Protection, secretion, and movement of sex cells
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Pseudostratified Columnar 400X
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Pseudostratified Columnar 400X
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Trachea 400X
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Stratified Squamous Epithelium
Location:Outer layers of skin, linings of mouth cavity, and anal canal Function: Protection Keratinazation- cells become filled with Keratin Keratin- protein found in skin that waterproofs skin
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Stratified squamous 400X
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Stratified squamous 400x
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Stratified Squamous 400X
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Our slides
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Our slides
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Our slides
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Transitional Epithelium
Location: Lining of urinary bladder, passageways of urinary tract Function: Distensibility and protection Distensibility- ability to change shape
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Transitional
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