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Epithelium Tissue

Simple Squamous Epithelium Function: 1. passage of materials by diffusion/filtration 2. secretes lubricating substances in serosae Location: 1. renal corpuscles 2. alveoli of lungs 3. lining of heart, blood, lymphatic vessels 4. lining of ventral body cavity (s
Simple Columnar Epithelium Function: 1. absorption 2. secretion of mucus, enzymes 3. ciliated type propels mucus or reproductive cells Location 1. ciliated: small bronchi, uterine tubes, uterus 2. nonciliated: digestive tract, gallbladder, some ducts
Simple Cuboidal Epithelium Function: 1. secretion and absorption Location: 1. kidney tubules 2. ovary surface 3. secretory portions of small glands
Pseudostratified Columnar Epithelium Function: 1. secretion of mucus 2. propulsion of mucus by cilia Location: 1. ciliated: trachea and most of upper respiratory tract 2. nonciliated: ducts of large glands, male reproductive tubes
Stratified Squamous Epithelium Function: 1. protect underlying tissues in abrasive areas Location: 1. Keratinized: epidermis of skin 2. Non-keratinized: lining of mucous membranes = esophagus, mouth, anus, vagina, urethrea
Stratified Cuboidal Epithelium Function: 1. protection Location: 1. Ducts of: mammary glands, salivary glands, largest sweat glands
Stratified Columnar Epithelium Function: 1. protection and secretion Location: 1. male urethra and large ducts of some glands
Transitional Epithelium Function: 1. permits distention of urinary organs by contained urine Location: 1. epithelium of urinary bladder 2. ureters 3. proximal urethra
Endocrine glands Ductless glands that secrete directly into surrounding tissue fluid and blood
Exocrine glands The products (sweat, mucus, oil, etc.) travel in ducts to epithelial surface
Goblet cell - Produce mucin: mucin + water --> mucus - unicellular exocrine gland - protect and lubricate many body surfaces
Multicellular exocrine glands - can have simple or compound ducts - can be tubular, alveolar, or tubuloalveolar
Tight junctions - prevent certain molecules from passing between epithelial cells - apical region of most epithelial tissue types - beltlike junction extends around periphery of each cell - degree of leakiness depends on the functions of the cells
Adhesive belt junctions - just below tight junctions in epithelial tissue - transmembrane linker proteins attach to actin microfilaments of cytoskeleton and bind adjacent cells - reinforce the tight junctions
Desmosomes - scattered along abutting sides of adjacent cells - cytoplasmic side of each plasma membrane has plaque, which are joined by linker proteins - intermediate filaments extend across cytoplasm and anchor to opposite side of the cell
Gap Junctions - passageway between 2 adjacent cells - let small molecules move directly between neighboring cells - cells are connected by hollow cylinders of protein - function in intercellular communication
Basal Lamina - non-cellular supporting sheet between epithelium and underlying CT - made up of proteins secreted by epithelial cells - acts as selective filter - acts as scaffolding along which regenerating epithelial cells can migrate
Microvilli - fingerlike extensions of plasma membrane of apical epithelial cells - occurs in almost every moist epithelium of the body - maximized surface area across which small molecules enter and leave - act as stiff knobs to resist abrasion
Cilia - whiplike, highly motile extensions of apical surface membranes of some cells - contain a core of microtubules held together by cross-linking and radial proteins - produces a propulsive power stroke, followed by a nonpropulsive recovery stroke
Flagellum - very long, single cilium - only human cells with these are sperm cells
Created by: peckman12



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