Which system includes the gastrointestinal tract and functions to break down food, absorb nutrients, and eliminate wastes?

Which system includes the gastrointestinal tract and functions to break down food, absorb nutrients, and eliminate wastes?

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

Answer: (D)

The digestive system is responsible for breaking down food, absorbing nutrients, and eliminating wastes. It starts with mechanical and chemical breakdown in the mouth and stomach, continues as nutrients are absorbed through the lining of the small intestine, and ends with waste elimination through the large intestine and beyond. This system is distinct from the circulatory system, which moves blood and nutrients around the body; the excretory system, which removes wastes primarily through the kidneys and bladder; and the endocrine system, which releases hormones to regulate body processes.

The digestive system is responsible for breaking down food, absorbing nutrients, and eliminating wastes. It starts with mechanical and chemical breakdown in the mouth and stomach, continues as nutrients are absorbed through the lining of the small intestine, and ends with waste elimination through the large intestine and beyond. This system is distinct from the circulatory system, which moves blood and nutrients around the body; the excretory system, which removes wastes primarily through the kidneys and bladder; and the endocrine system, which releases hormones to regulate body processes.