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        | groups of cells similar in structure that perform a common function |  | 
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        | composed almost entirely of cells; covered outside of body or line inside of internal cavities |  | 
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        | free; exposed to exterior environment or interior of cavity |  | 
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        | attached to underlying connective tissue |  | 
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        | no blood supply; diffusion from blood vessels of connective tissue |  | 
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        | rapidly replaces lost cells by cell division (stratified epithelial tissue) |  | 
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        | substance passes through cell into blood or lymph |  | 
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        | release of a substance made by a cell to its exterior |  | 
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        | exchange of substances by diffusion (ex: gases) |  | 
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        | elimination of waste (ex: metabolic waste products by biochemical bonds) |  | 
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        | barrier between two environments by selective permeability |  | 
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        | many layers of cells stacked on each other |  | 
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        | what are cells named for? |  | 
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        | one or more cells that makes a secretion and releases (secretes) it to the exterior of the cell |  | 
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        | developed form epithelial tissue |  | 
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        | individual cells that are a part of the covering and lining epithelial tissue   |  | 
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        | ductless glands (ex: thyroid, pituitary, testes, ovaries)
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        | secretions (hormones) released from cell via exocytosis into ECF then enters bloodstream |  | 
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        | secrete products onto body surface or into cavities |  | 
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        | products are secreted by exocytosis into duct (ex: sweat glands)
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        | products are secreted by the rupture of gland cells into duct (ex: sebaceous glands)
 *mitotic process!
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        | unstructured material between cells. sieve through which nutrients diffuse between blood capillaries and cells
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        | fiber that has tensile (pulling) strength |  | 
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        | thin fibers; allow stretch and recoil |  | 
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        | composted of ground substance, fibers, and cells composed of widely scattered cells within extracellular matrix
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        | active connective tissue proper (most) |  | 
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        | inactive, mature form of cells |  | 
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        | elongated cells that use ATP to generate force (contract) |  | 
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        | two cell types: neurons and neuroglial cells |  | 
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        | specialized cells; conduct electrical signals |  | 
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        | support, insulate and protect neurons |  | 
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        | function is to transmit electrical signals to and from muscles and glands |  | 
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        | froms continuos sheets held together by tight junctions and desmosomes |  | 
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        | serves as a boundary between environments |  | 
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        | aqueous fluid containing proteins, steroids, or lipids depending on glands |  | 
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        | active form (~blast) secretes fibers and ground substance |  | 
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