Which of the following is absorbed in proximal intestine

Options

A. Iron
B. sodium
C. Bile salts
D. Vitamin `B_(12)`

Answer

To determine which substance is absorbed in the proximal intestine (specifically the duodenum), we will evaluate each option provided.

### Step-by-Step Solution:

1. **Understanding the Proximal Intestine**:
- The proximal intestine refers to the duodenum, which is the first part of the small intestine. It is important to know which nutrients are absorbed in this section.

2. **Evaluating the Options**:
- **Option 1: Iron**:
- Iron is absorbed in the duodenum through active transport. This means that iron is indeed absorbed in the proximal intestine.
- **Option 2: Sodium**:
- Sodium absorption primarily occurs in the large intestine, not in the proximal intestine. Therefore, this option is incorrect.
- **Option 3: Bile Salts**:
- Bile salts are absorbed in the ileum, which is the distal part of the small intestine, not in the duodenum. Thus, this option is also incorrect.
- **Option 4: Vitamin B12**:
- Vitamin B12 absorption occurs in the ileum as well, not in the proximal intestine. Therefore, this option is incorrect too.

3. **Conclusion**:
- After evaluating all options, the only correct answer is **Iron**, which is absorbed in the proximal intestine (duodenum).

### Final Answer:
The substance that is absorbed in the proximal intestine is **Iron**.

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