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It's actually part of two organ systems. Digestive and Muscular. Source: My Anatomy and Physiology textbook. The tongue is part of the digestive system.
Full Definition of TONGUE. 1. a: a fleshy movable muscular process of the floor of the mouths of most vertebrates that bears sensory end organs and small glands and functions especially in taking and swallowing food and in humans as a speech organ b: a part of various invertebrate animals that is analogous to the tongue.