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What is EPITHELIUM?
- sheet of cells
- covers exposed areas
- lines internal cavities
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What are the functions of EPITHEIAL TISSUE?
- provide physical protection
- control permeability
- provide sensation
- produce secretions
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What is involved in maintaining the integrity of EPITHELIUM?
- intercellular connections
- attachment to basal lamina
- self perpetuated renewal
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What is SIMPLE epithelium?
only 1 layer
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What is STRATIFIED epithelia?
several layers
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What is SQUAMOUS epithelia?
thin flat cells
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What is CUBOID epithelia?
height equal to width
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What is TRANSITIONAL epithelia?
changes shape
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What is COLUMNAR epithelia?
height is 3-4x width
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Describe SIMPLE SQUAMOUS epithelia.
- in blood vessels
- reduces friction
- lines body cavity
- controls vessel permeability
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Describe STRATIFIED SQUAMOUS.
- in mouth, throat, esophagus, and anus
- a lot of layers
- flatter towards top
- protect v pathogens
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Describe SIMPLE CUBOIDAL epithelia.
- lines kidneys
- 1 layer
- tube
- secretion and absorption
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Describe STRATIFIED CUBOIDAL epithelia?
- lines some ducts
- protect
- secrete
- absorb
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Describe SIMPLE COLUMNAR epithelia.
- in digestive tract
- and uterine tubes
- protect
- absorb
- secrete
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Describe STRATIFIED COLUMNAR epithelia.
- for protection
- less common
- pharynx, epiglottis, anus, mammaty gland
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Describe PSEUDOSTRATIFIED CILIATED COLUMNAR epithelia.
- only one with cilia
- protection and secretion
- everything touches basal lamina
- lines respiratory tract
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Describe TRANSITIONAL epithelia.
- in urinary bladder, renal pelvis, and ureters
- stretches (recoils) and relaxes (expands)
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Describe SEROUS GLANDS.
secrete watery fluids rich in enzymes
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Describe MUCOUS GLANDS.
secrete glycoproteins (mucins) that absorb water to form mucus
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Describe MIXED EXOCRINE GLANDS.
contain cells capable of both serous and mucous secretions and secrete both
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Example of SIMPLE TUBUALR.
intestinal glands
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Example of SIMPLE COILED TUBULAR.
merocrine sweat glands (watery)
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Example SIMPLE BRANCHED TUBULAR.
- gastric glands
- mucous glands of esophagus, tongue, and duodenum
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Example of SIMPLE ALVEOLAR.
- not in adult
- stage ofdevelopment
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Example of SIMPLE BRANCHED ALVEOLAR.
sebaceous glands (oil)
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Example of COMPOUND TUBULAR.
- male reproductive glands
- (testes)
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Example of COMPOND ALVEOLAR.
mammary glands
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Example of COMPOUND TUBULOALVEOLAR.
- salivary glands
- glands of respiratory passages
- pancreas
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Describe APOCRINE SECRETION.
- loss of cytoplasm
- cytoplasmic components shed at apical surface
- gland cell goes through period of growth and repair
- (everything gathers in apical surface and part breaks off)
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Describe MEROCRINE SECRETION.
secretory vesicles discharged at surface of gland cell through exocytosis.
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Describe HOLOCRINE SECRETION.
- cell division replaces lost cells
- cells produce secretion, size increases
- cells burst, releasing cytoplasmic contents
- (stem cells at base always reproducing, explode @top)
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