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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.
Physical Cause. The tongue is primarily composed of muscles. It is covered with a mucous membrane. The upper surface of the tongue has small bumps called papillae. Taste buds reside between the small bumps. When the papillae grow longer and do not properly shed, a black appearance develops, which is called black tongue.