What is the primary function of the enteric (GI) system?

The primary function of the enteric (gastrointestinal) system encompasses the complete digestion and processing of food from the mouth to the anus. This system is designed to break down complex food substances into simpler molecules that can be absorbed and utilized by the body. Food undergoes various stages of processing, including ingestion, mechanical breakdown, chemical digestion, absorption of nutrients and water, and ultimately the elimination of indigestible material.

While absorption of water and nutrients is a significant aspect of the GI system, the overall process includes the entire journey of food through different organs, which is more comprehensive than just absorption alone. Mechanical processing is also critical, but it is only one part of the broader digestive process. The secretion of hormones plays a vital role in regulating digestion, yet it does not encompass the entirety of the enteric system's functions. Therefore, the correct answer highlights the full scope of the GI system's role in digestion and processing food.