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Epithelial tissue
A layer of cells that forms a superficial covering or an internal lining of a body cavity or a vessel; Lines, protects, secretes
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Muscle tissue
A tissue characterized by the presence of cells capable of contraction; includes skeletal, cardiac, and smooth muscle tissues; Excitable, contractile tissue for movement
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Nervous tissue
Excitable tissue used to send short term signals throughout the body
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Connective tissue
Provides a structural framework that stabilizes the relative positions of the other tissue types; includes connective tissue proper, cartilage, bone, and blood; contains cell products, cells, and ground substance; Living cells in a non-living matrix (EX: ears)
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Apical surface
Top; exposed to "open" air
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Basal surface
Attached to basement membrane
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Basement membrane
A layer of filaments and fibers that attach an epithelium to the underlying connective tissue; also called basal lamina
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Simple squamous epithelium
Reduces friction, controls vessel permeability, performs absorption and secretion; Locations: Alveoli of lungs
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Stratified squamous epithelium
Provides physical protection against abrasion, pathogens, and chemical attack; Location: Surface of skin
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Simple cuboidal epithelium
Limited protection, secretion, absorption; Location: Thyroid gland
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Simple columnar epithelium
Protection, secretion, absorption; Location: Lining of stomach
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Goblet cell
White areas or patches; produce mucus, lines cells to keep moist
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Pseudostratified ciliated columnar epithelium
Protection, secretion, move mucus with cilia; Location: Lining of nasal cavity
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Keratinized
Hardened tissues, filament of protein, water-resistant; With dead cells (EX: hair)
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Non-keratinized
No dead cells (EX: oral cavity, pharynx, anus)
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Stratified columnar epithelium
Protection: Location: Small areas of the pharynx
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Transitional epithelium
Permits expansion and recoil after stretching; Location: urinary bladder
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What are glands composed of?
Collections of epithelial cells (or structures derived from epithelial cells) that produce secretions
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Exocrine gland
Secretes onto the body surface or into a passageway connected to the exterior; Secretes through ducts; Products go to places "outside" the body (sweat glands, tear glands, adrenaline glands)
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Endocrine gland
Secretes hormones into the blood; Secretes into interstitial fluid. No ducts.
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Tissue
A collection of specialized cells and cell products that performs a specific function
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