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9 Cards in this Set
- Front
- Back
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Tight/Occulding Junctions
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-LIMITED TO EPITHELIUM
-belt of ridges, barrier of H2O, separates apical surface form basolateral space, maintains polarity of cell preventing migration of basolateral proteins - formed by transmembrane proteins making contact |
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Intermediate Junction/ Zonula adherens
(Adhering) |
-located below tight junctions, held together by transmembrane linker proteins (CAM)
-actin bundles run parallel to junction, attached by intracellular attachment proteins -located in GIT -give cell mechanical strength -contraction of actin filaments bundle cause protrusion of cell surface and splaying of microvilli |
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Desmosomes
(Adhering) |
-disk like
-counterpoint in adjoining cell -link cytoskeleton of adjacent epithelial cells to increase mechanical strength -central intercellular electron-dense line -attachment plaque, formed from intracellular proteins with intermediate filaments attached to it |
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Hemidesmosomes
(Adhering) |
-Half desmosome
-transmembrane proteins attach to extracellular matrix |
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Gap Junctions
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-narrow space bridged by connexons with a pore
-present in all cells except between skeletal muscle, blood cells and spermatozoa -fxns: allow communication btw cells synchronization of fxn large molecules cannot pass, mostly inorganic ions, water soluble |
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Cilia and Flagellum
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-location:
resp. tract, female/male reproductive system visible with LM, beat in sequence -axonemes: 2 central, 9 doublets, dynein arms, ATPase -basal body at located at base, identical centriole in structure, one in cilium, two centrioles in flagellum |
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Microvilli
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-increase absorption surface area
-cytoplasmic envaginations of free surface -parallel actin filaments in core, actin attached to terminal web and to plasma membrane by myosin |
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Stereocilia
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-long microvilli, NOT CILIA
-NARROWER AT BASE -don't beat -rigid due to actin filaments and detect minute fluid movements in inner ear -location: epididymus, ear |
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Basal Folding
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-folds of plasma membrane, containing mitochondria
-involved in active transport of ions |
