Final answer:
The three parts of the small intestine are the duodenum, where most chemical digestion occurs, the jejunum, where most of the nutrient absorption takes place, and the ileum, which absorbs remaining nutrients. The correct answer to the question is d. Ileum, Jejunum, Duodenum.
Step-by-step explanation:
The small intestine is divided into three parts: the duodenum, jejunum, and ileum. Each of these parts has a specific function in the digestion and absorption of food:
- The duodenum is the first part of the small intestine and is where most chemical digestion occurs.
- The jejunum is the second part, and it is mainly responsible for the absorption of nutrients into the bloodstream.
- The ileum is the third and final part of the small intestine, where a few remaining nutrients are absorbed. The ileum is covered in villi to increase the surface area for absorption.
The correct answer to the question "The small intestines are divided into three parts. Which of the following is a part?" is d. Ileum, Jejunum, Duodenum.