In which organ does the majority of nutrient absorption occur?

• A. Large intestine
• B. Stomach
• C. Small intestine
• D. Liver

Answer: (C)

The small intestine is the primary site for nutrient absorption in the digestive system. This organ has specialized structures, such as villi and microvilli, which increase its surface area significantly. This adaptation allows for a more efficient absorption of nutrients, including carbohydrates, proteins, fats, vitamins, and minerals, from the digested food.

In addition to its large surface area, the small intestine is lined with epithelial cells that contain transport mechanisms, facilitating the movement of these nutrients into the bloodstream. The small intestine consists of three parts: the duodenum, jejunum, and ileum, each playing important roles in the digestion and absorption processes. The duodenum is where most chemical digestion occurs with the help of bile and pancreatic enzymes, while the jejunum and ileum are primarily involved in the absorption of the nutrients.

The other options do not serve as primary sites for nutrient absorption. The large intestine primarily absorbs water and electrolytes and processes indigestible food residues. The stomach primarily functions in the mechanical and chemical breakdown of food, with limited absorption taking place. The liver plays a crucial role in metabolism and detoxification, but it is not directly involved in the absorption of nutrients from digested food. Therefore, the small intestine stands out as the