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11 terms

A&P Midterm, Terms

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Tight Junctions
Important in restricting xport. Fusions of adjacent plasma membranes.
Desmosomes
Macula adherens. w/ Keratin filaments. Important in skin and urinary bladder. Anti-stress.
Hemidesmosomes
Anchor the basal membrane of an epithelial cell to its underlying connective tissue.
Zona Adherens
Contractile actin filament anchoring. Bending.
Gap Junctions
Contain connexons. Allows ions/electrical impulses to pass. Primarily cardiac muscle cells and smooth muscle cells.
Mast Cell
Connective Tissue: Inflammatory reaction. Secretes histamine and heparin.
Merkel discs, Meissner's Corpuscles
Stratum basal contains these touch recepors:
Melanocytes
In stratum basal, produce melanin (pigmant) to hair and skin
Langerhans cells
Are phagocytic cells in the spinosum layer. Stimulate an immune response when they encounter disease causing microbes.
Lucidum
Accumulated keratin in this layer but not yet flattened.
Sebaceous glands
Secretes oily sebum at the base of the hairs. Helps retain moistureon skin. Washing dries it out!