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9 Cards in this Set

  • Front
  • Back
Tight/Occulding Junctions
-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
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
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
Hemidesmosomes

(Adhering)
-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
-fxns:
allow communication btw cells
synchronization of fxn
large molecules cannot pass, mostly inorganic ions, water soluble
Cilia and Flagellum
-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
Microvilli
-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
Stereocilia
-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
Basal Folding
-folds of plasma membrane, containing mitochondria
-involved in active transport of ions