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1 Parenchyma cells remain alive at maturity and can become meristematic, as in INTERFASCICULAR CAMBIUM (see SECONDARY THICKENING). See Fig. 246 2  . 2 the loose, vacuolated cells that form much of the body tissue of platyhelminths.  3 any specific organ cells apart from connective tissues and blood vessels.
(1) The fundamental tissue in plants. Parenchyma is composed of cells having a polyhedral shape, with the various diameters differing very little from each other. The cells form homogeneous aggregates in the plant body and fill the spaces between other tissues. They serve as part of the conductive and mechanical tissues.