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9 Cards in this Set

  • Front
  • Back
Tight/Occulding Junctions
-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
Intermediate Junction/ Zonula adherens

-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

-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

-Half desmosome
-transmembrane proteins attach to extracellular matrix
Gap Junctions
-narrow space bridged by connexons with a pore
-present in all cells except between skeletal muscle, blood cells and spermatozoa
allow communication btw cells
synchronization of fxn
large molecules cannot pass, mostly inorganic ions, water soluble
Cilia and Flagellum
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
-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
-long microvilli, NOT CILIA
-don't beat
-rigid due to actin filaments and detect minute fluid movements in inner ear
epididymus, ear
Basal Folding
-folds of plasma membrane, containing mitochondria
-involved in active transport of ions