An animal cell is a fundamental component of the animal body and is responsible for carrying out various physiological and metabolic functions. Synonyms for the animal cell include eukaryotic cell, multicellular cell, heterotrophic cell, and pluricellular cell. Eukaryotic cells are defined as a cell that has a distinct nucleus and other membrane-bound organelles. Multicellular cells refer to cells that make up the body of a complex organism such as animals, plants, and fungi. Heterotrophic cells are those that cannot produce their energy and rely on other organisms to obtain nutrients. Finally, pluricellular cells refer to a cluster of cells that make up complex organisms like animals and plants.