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Unformatted text preview: filtration. Cuboidal or columnar cells, which contain more organelles, secrete or absorb. A smooth, free surface reduces friction. Microvilli increase surface area, and cilia move materials over the cell surface. Desmosomes mechanically bind cells together, tight junctions form a permeability barrier, and gap junctions allow intercellular communication. Hemidesmosomes mechanically bind cells to the basement membrane. Glands A gland is a single cell or a multicellular structure that secretes. Exocrine glands have ducts, and endocrine glands do not. Connective Tissue Connective tissue holds cells and tissues together. Connective tissue has an extracellular matrix consisting of protein fibers, ground substance, and fluid. Collagen fibers are flexible but resist stretching, reticular fibers form a fiber network, and elastic fibers recoil. Blast cells form the matrix, cyte cells maintain it, and clast cells break it down....
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.
- Fall '10