Correct sequence of the following is

Options

A. Duodenum, ileum, jejunum
B. Jejunum, duodenum, ileum
C. Ileum, duodenum, jejunum
D. Duodenum, jejunum, ileum

Answer

To determine the correct sequence of the parts of the small intestine, we need to understand the order in which these sections occur during digestion. The small intestine is divided into three main parts:

1. **Duodenum**: This is the first section of the small intestine. It is responsible for the majority of chemical digestion. Here, enzymes from the pancreas and bile from the liver aid in breaking down food.

2. **Jejunum**: This is the second section of the small intestine. It is primarily involved in the absorption of nutrients. The walls of the jejunum are lined with villi, which increase the surface area for absorption.

3. **Ileum**: This is the final section of the small intestine. The ileum is responsible for the absorption of remaining nutrients, including water and vitamins. It connects to the large intestine.

Now, let's analyze the options provided in the question:

1. **Duodenum, Ileum, Jejunum**
2. **Jejunum, Duodenum, Ileum**
3. **Ileum, Duodenum, Jejunum**
4. **Duodenum, Jejunum, Ileum**

From our understanding of the anatomy of the small intestine, the correct sequence is:

- First: Duodenum
- Second: Jejunum
- Third: Ileum

Thus, the correct answer is option **4: Duodenum, Jejunum, Ileum**.