Amino acids are absorbed in-

Options

A. Blood cappilaries of villi
B. Wall of rectum
C. Lacteals and blood capollaries of valli
D. Lacteals of villi

Answer

**Step-by-Step Solution:**

1. **Understanding Amino Acid Absorption**: Amino acids, which are the building blocks of proteins, are absorbed primarily in the small intestine, specifically in the duodenum and jejunum regions.

2. **Mechanism of Absorption**: The absorption of amino acids occurs through active transport mechanisms. This means that energy is required to move amino acids across the intestinal cell membranes.

3. **Absorptive Cells**: Once in the small intestine, amino acids are absorbed by specialized cells known as absorptive cells (enterocytes). These cells facilitate the uptake of amino acids from the intestinal lumen.

4. **Conversion to Free Amino Acids**: After absorption into the absorptive cells, the amino acids are converted into single free amino acids, which are then ready for transport.

5. **Transport to Capillaries**: The free amino acids then move through the process of simple diffusion into the capillaries located within the villi of the small intestine.

6. **Circulation to the Liver**: Once in the capillaries, the amino acids enter the bloodstream and are transported to the liver or distributed throughout the general circulation for use by the body.

7. **Identifying the Correct Answer**: The question asks where amino acids are absorbed. Based on the information, the correct answer is that amino acids are absorbed in the blood capillaries of the villi.

**Final Answer**: Amino acids are absorbed in the blood capillaries of the villi.

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