Curtin, Charles B. Department of Biology, Creighton University, Omaha, Nebraska.
Last reviewed:July 2020
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An aggregation of cells more or less similar morphologically and functionally. A tissue comprises an agglomeration of structurally and functionally similar cells and their intercellular material. Tissues are found in multicellular organisms, including animals and plants. The animal body is composed of four primary tissues—namely, epithelium, connective tissue (including bone, cartilage, and blood), muscle, and nervous tissue. Most plants are also composed of coherent masses of cells called tissues. The tissues of a plant are organized into three systems—the dermal tissue system, the ground tissue system, and the vascular tissue system. The process of differentiation and maturation of tissues is called histogenesis. See also: Cell (biology); Connective tissue; Epithelium; Plant tissue systems
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