histology intro p1
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1
Microscopic study of tissues?
Histology
2
Level of organization composed of groups of similar cells performing a common function?
Tissue level of organization
3
Four basic tissue types of the body?
Epithelial, connective, muscle, and nervous tissue
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Embryonic layers that give rise to tissues?
Germ layers
5
Inner germ layer forming the lining of the digestive tract and its derivatives?
Endoderm
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Middle germ layer forming muscle, bone, and blood vessels?
Mesoderm
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Outer germ layer forming skin and neuroectoderm?
Ectoderm
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Tissue that covers body surfaces and forms glands?
Epithelial tissue
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Characteristic of epithelium where cells are closely packed?
Consists almost entirely of cells
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Surface of epithelium exposed to the outside or a cavity?
Free surface
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Surface of epithelium attached to underlying tissue?
Basal surface
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Feature of epithelium indicating absence of blood vessels?
Avascular
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Ability of epithelial cells to divide rapidly?
Undergoes mitosis
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Function of epithelium that shields underlying structures?
Protecting underlying structures
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Function of epithelium that blocks or controls movement of substances?
Acting as barriers
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Function of epithelium involving release of substances?
Secretion of substance
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Function of epithelium involving intake of substances?
Absorption of substances
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Epithelium consisting of a single layer of cells?
Simple epithelium
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Simple epithelium made of flat cells?
Simple squamous epithelium
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Simple epithelium made of cube-shaped cells?
Simple cuboidal epithelium
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Simple epithelium made of tall cells?
Simple columnar epithelium
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Epithelium composed of multiple layers of cells?
Stratified epithelium
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Epithelium that appears layered but is actually one layer?
Pseudostratified epithelium
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Epithelium that changes shape when stretched?
Transitional epithelium
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Cell surface projections that increase surface area for absorption or secretion?
Microvilli
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Cell surface structures that move materials across the surface?
Cilia
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Cell junctions that bind cells together?
Desmosomes
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Cell junctions that form a permeability barrier?
Tight junctions
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Cell junctions that allow intercellular communication?
Gap junctions
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Structures formed by epithelium that produce and secrete substances?
Glands
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Glands that secrete through ducts?
Exocrine glands
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Glands that secrete directly into the bloodstream without ducts?
Endocrine glands
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Unicellular exocrine gland found in epithelial tissue?
Goblet cell
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Exocrine secretion released by exocytosis?
Merocrine secretion
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Exocrine secretion where part of the cell is released?
Apocrine secretion
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Exocrine secretion involving complete cell destruction?
Holocrine secretion
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