What does the digestive system primarily absorb?

The digestive system primarily absorbs nutrients, which is crucial for maintaining the body's functions and overall health. Once food is ingested and broken down by the digestive organs, the small intestine plays a vital role in the absorption process. Here, essential nutrients such as carbohydrates, proteins, fats, vitamins, and minerals are absorbed into the bloodstream. This absorption is facilitated by the large surface area of the intestinal lining, which contains villi and microvilli that enhance nutrient uptake.

While excess water is also absorbed in the digestive process, particularly in the large intestine, the primary purpose of the digestive system is to extract and provide the body with nutrients from the food consumed. Oxygen, on the other hand, is absorbed by the respiratory system, and waste products are usually excreted rather than absorbed. This distinction is important in understanding the unique functions of different body systems in relation to digestion and metabolism.