Which of the following digestive processes mainly happens in the jejunum?

The absorption of nutrients is a key function of the jejunum, which is the second part of the small intestine. During digestion, carbohydrates and proteins are broken down into simpler molecules. Although the initial breakdown of carbohydrates and proteins begins in the stomach and continues in the duodenum with the help of pancreatic enzymes, the jejunum is primarily responsible for the further breakdown and absorption of these nutrients.

In the jejunum, enzymes continue to act on carbohydrates, converting them into simple sugars like glucose, which are then absorbed into the bloodstream. Additionally, the jejunum is pivotal in breaking down protein into amino acids, which are also absorbed in this section of the digestive tract. Hence, the major role of the jejunum is to facilitate the absorption of nutrients that have been broken down into their simplest forms, rather than solely focusing on the creation of bile or the secretion of digestive enzymes, which occurs in other parts of the digestive system.