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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.
1 The tongue helps the teeth and other parts of the mouth with chewing food and passing it down the throat as the first part of the swallowing process. 2  Cleaning. 3  The movements of the tongue dislodge food particles stuck between the teeth, gum and cheek so that it can be spat out or swallowed.