Walkley, Steven U. Department of Neuroscience, Rose F. Kennedy Children’s Evaluation and Rehabilitation Center, Albert Einstein College of Medicine, Bronx, New York.
Last reviewed:June 2020
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- Principal roles
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A membrane-bounded digestive structure found within virtually all types of animal cells. Lysosomes are major membrane-enclosed organelles involved in intracellular degradation of biological materials in most animal cells. Lysosome sizes, microscopic appearances, and other properties vary among different cell types and circumstances, owing in part to differences in their functions and states. Typical lysosomes (Fig. 1 and Fig. 2) are roughly spherical or elongate bodies, with largest dimensions of 0.1–1 μm (0.000004–0.00004 in.) or greater. Tens to hundreds of lysosomes may be present in a single cell. See also: Cell (biology); Cell organization
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