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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.
When you first smell a food, or maybe even think about it, your mouth produces saliva, which helps to break down chemicals in the food. When you are done chewing, your tongue pushes the food down into the opening of your esophagus, which is the second part of the digestive system process. The epiglottis is the small piece of tissue that helps the food go into your esophagus instead of somewhere else.