What is the primary function of the digestive system?

What is the primary function of the digestive system?

• A. To break down food into absorbable nutrients and eliminate indigestible waste.
• B. To transport oxygen to tissues.
• C. To regulate body temperature.
• D. To produce hormones for metabolism.

Answer: (A)

The digestive system’s main job is to break down food into nutrients the body can use and to eliminate indigestible waste. It starts with mechanical and chemical processes in the mouth, continues with stomach acids and enzymes that further break down food, and then uses the small intestine’s enzymes and bile to absorb nutrients into the bloodstream and lymphatic system. In the large intestine, water is absorbed and waste is formed into feces for elimination. This function provides the body with energy, building blocks, and materials needed for growth and repair. The other options point to activities handled by different systems: transporting oxygen is the job of the circulatory and respiratory systems, regulating body temperature involves the skin and metabolic processes, and producing hormones for metabolism is primarily an endocrine function (even though digestion involves hormones, its primary purpose is digestion and absorption).

The digestive system’s main job is to break down food into nutrients the body can use and to eliminate indigestible waste. It starts with mechanical and chemical processes in the mouth, continues with stomach acids and enzymes that further break down food, and then uses the small intestine’s enzymes and bile to absorb nutrients into the bloodstream and lymphatic system. In the large intestine, water is absorbed and waste is formed into feces for elimination. This function provides the body with energy, building blocks, and materials needed for growth and repair. The other options point to activities handled by different systems: transporting oxygen is the job of the circulatory and respiratory systems, regulating body temperature involves the skin and metabolic processes, and producing hormones for metabolism is primarily an endocrine function (even though digestion involves hormones, its primary purpose is digestion and absorption).