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organelle
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How different parts of a cell interact
How different parts of a cell interactLearn about the different cell organelles, including the mitochondrion, the nucleus, the ribosome, and others.
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organelle, any of the specialized structures within a cell that perform a specific function (e.g., mitochondria, ribosomes, endoplasmic reticulum). Organelles in unicellular organisms are the equivalent of organs in multicellular organisms. The contractile vacuole of protozoans, for example, extracts fluid wastes from the cell and eliminates them from the organism, as does the kidney in larger organisms.

This article was most recently revised and updated by Kara Rogers.