BIOL 1141 Chapter Notes - Chapter 31: Circulatory System, Integumentary System, Poikilotherm
25 Feb 2017
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Tissue: composed of specialized cells of the same or similar type that perform a function in the body. Epithelial tissue: covers body surfaces, lines body cavities, and forms glands. Tightly packed cells that form a continuous layer. Protective function but can be modified to carry out secretion, absorption, excretion, and filtration. Tight junctions: regions where proteins join them together. Adhesion junctions: add strength and allow epithelial cells to stretch and bens. Gap junctions: protein channels that permit the passage of molecules between two adjacent cells. Attached to a basement membrane which is simply a thin layer of various types of proteins that anchors the epithelium to the extracellular matrix (type of connective tissue) Squamous epithelium: composed of flattened cells, lines blood vessels and air sacs of lungs. Cuboidal epithelium: contains cube-shaped cells and is found lining the kidney tubules and various glands.
