Which body system is responsible for turning food into nutrients and eliminating waste?

• A. Digestive system
• B. Circulatory system
• C. Nervous system
• D. Endocrine system

Answer: (A)

The digestive system is responsible for turning food into nutrients and eliminating waste. It begins in the mouth with chewing and saliva, continues through the esophagus to the stomach where acids and enzymes break food down further, and then into the small intestine where most nutrients are absorbed into the bloodstream. The leftover material moves to the large intestine, where water is absorbed and waste is formed for elimination. This system supplies nutrients to body tissues, including skin, and works alongside the circulatory system to transport those nutrients, while the nervous and endocrine systems help regulate how digestion occurs.