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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.
Chapter 22 The Digestive System 4. The Tongue. ï list the four primary functions of the tongue: ï define lingual frenulum: ï small lingual glands below the epithelium of the tongue produce secretions that contain water, mucus, and the enzyme lingual lipase, which digests lipids.