Name various parts of small intestine. Which part is modified for absorption?

Explanation

### Step-by-Step Solution:

1. **Identify the Small Intestine**: The small intestine is a crucial part of the gastrointestinal tract where the majority of nutrient absorption occurs. It lies between the stomach and the large intestine.

2. **Parts of the Small Intestine**: The small intestine is divided into three distinct sections:
- **Duodenum**: This is the first section and the shortest part of the small intestine. It is where the initial preparation for absorption begins, aided by digestive juices from the pancreas and bile from the liver.
- **Jejunum**: This is the middle section of the small intestine. It is specialized for absorption due to its lining, which contains cells known as enterocytes that facilitate the absorption of nutrients.
- **Ileum**: This is the final and longest section of the small intestine. Its primary function is to absorb vitamin B12, bile salts, and any remaining nutrients that were not absorbed in the jejunum.
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