In small intestine, the pH value is

Options

A. 7
B. 8
C. 8.5-9.0
D. 2.5-4.5

Answer

To determine the pH value in the small intestine, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Digestive Process**:
- Food travels from the mouth to the stomach, and then it moves into the small intestine.

2. **pH in the Stomach**:
- In the stomach, the pH is quite acidic, typically ranging from 3 to 4. This acidity helps in the digestion of food.

3. **Transition to the Small Intestine**:
- After the stomach, the partially digested food (chyme) enters the small intestine.

4. **pH in the Small Intestine**:
- In the small intestine, the pH increases to around 7. This is a neutral pH, which is important for the proper functioning of digestive enzymes.

5. **Role of Sodium Bicarbonate**:
- The increase in pH is primarily due to the secretion of sodium bicarbonate (NaHCO3) from the pancreas. This bicarbonate neutralizes the acidic chyme coming from the stomach.

6. **Conclusion**:
- Therefore, the pH value in the small intestine is approximately 7, which is essential for optimal digestion and absorption of nutrients.

### Final Answer:
In the small intestine, the pH value is 7, maintained by sodium bicarbonate secreted by the pancreas.

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