Where in the body are the majority of nutrients absorbed?

The majority of nutrients are absorbed in the small intestine, which plays a critical role in digestion and nutrient absorption. The small intestine, composed of three parts—duodenum, jejunum, and ileum—has extensive surface area due to its lining, which is covered in villi and microvilli. This structure allows for maximum absorption of nutrients such as carbohydrates, proteins, fats, vitamins, and minerals into the bloodstream.

While the stomach and large intestine participate in digestion and absorption, they do so to a limited extent compared to the small intestine. The stomach mainly focuses on the initial stages of digestion through mechanical and chemical processes and does not significantly contribute to nutrient absorption. The large intestine primarily absorbs water and electrolytes and is involved in the formation of waste but does not absorb the majority of nutrients. The internal wall could refer to various structures, but it does not specify the small intestine where the primary absorption occurs.

Understanding the role of the small intestine in nutrient absorption is crucial for grasping how the digestive system functions and how the body obtains essential nutrients from food.