Tissues2 - - cellularity- specialized contacts- polarity-...

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Tissues: The Living Fabric Cell-Cell Junctions & Communication: - Adhesion junctions (desmosomes): cytoplasmic plaques within two cells are joined by intercellular filaments - Tight junctions: plasma membrane proteins of two adjacent cells attach, producing a zipperlike fastening important in forming barriers to neighboring cells of a different type (e.g.: digestive tract cells with very low pH) - Gap junctions: Channel proteins from 2 adjacent cells join, forming a continuous channel between the 2 cells important in muscle cell communication Epithelial Tissue (epithelium): a sheet of cells that lines a body cavity or covers a body surface - : skin & lining of body cavities - glandular epithelium: forms glands - many functions: protection, absorption, secretion, excretion, filtration, sensory reception Characteristics of Epithelial Tissue:
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Unformatted text preview: - cellularity- specialized contacts- polarity- support by connective tissue- avascular but innervated- capable of regeneration Classification of Epithelia:- squamous (flattened), cuboidal (cube-shaped), & columnar (column-shaped) cells- simple (1 layer) or stratified (multiple layers) Simple Squamous Epithelial Tissue: single layer of flattened cells with disc-shaped nuclei & little cytoplasm- locations: in kidney glomeruli, air sacs of lungs, heart lining, blood vessels & lymphatic vessels, lining of ventral body cavity- functions: diffusion & filtration; secretes lubricating substances in serosae Simple Cuboidal Epithelial Tissue: single layer of cube-shaped cells with large spherical nuclei; often seen in circular pattern when cut in cross section- locations: in kidney tubules, ducts of small glands, ovary surface...
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Tissues2 - - cellularity- specialized contacts- polarity-...

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