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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.
The tongue is a muscular hydrostat on the floor of the mouth of most vertebrates that manipulates food for mastication.It is the primary organ of taste (gustation), as much of its upper surface is covered in taste buds.The tongue's upper surface is also covered in numerous lingual papillae.n phonetics and phonology, a distinction is made between the tip of the tongue and the blade (the portion just behind the tip). Sounds made with the tongue tip are said to be apical, while those made with the tongue blade are said to be laminal.