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The digestive system is contained within the gastrointestinal system, which is part of the overall human body's organ system.
The pharynx belongs to both the respiratory system and the digestive system. It serves as a passageway for air to travel from the mouth and nose to the trachea and for food to travel from the mouth to the esophagus.
No, the trachea is not part of the digestive system. It is part of the respiratory system and functions to carry air to and from the lungs for breathing.
Pepsin works in the stomach in the digestive system.
The digestive system breaks down food into nutrients that the body can use for energy and growth.