ANPS 019 Lecture Notes - Lecture 6: Tight Junction, Histology, Extracellular Fluid
14 Sep 2018
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Document Summary
Collections of specialized cells and cell products organized to perform one or more select functions. All cells in the body are classified in one of the four tissue types: epithelial, connective, nervous, muscular. Each tissue has unique characteristics determined by properties of its cells. Different cell types have different composition of proteins, carbohydrates, lipids and nucleic acids, so different cell types stain differently. Any organ is any body structure built with at least two tissues that carries out a specific function. Molecules cannot pass down the space between the two cells. Desmosomes anchoring proteins extend across the extracellular space and attach the cells to each other. Gap junction cells are connected by membrane proteins that form pores between cells. Cytoplasm of one cell is continuous with cytoplasm of adjacent cell allowing ions to move between cells. Important in electrical signaling and organs where cells work in close synchrony. Advantages of interconnected cells: regulating movement of materials between areas.
