Ptyalin is secreted by -

Options

A. Stomach
B. Salvary gland
C. Pancreas
D. Bile, alkaline.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the source of secretion for the enzyme Ptyalin.

2. **Identifying the Enzyme**: Ptyalin is an enzyme that is involved in the digestion of starch. It is also known as alpha-amylase.

3. **Function of Ptyalin**: This enzyme breaks down starch into simpler sugars, such as maltose and dextrin. This process begins in the mouth when food is mixed with saliva.

4. **Source of Secretion**: Ptyalin is secreted by the salivary glands. It is present in human saliva, which is why it plays a crucial role in the initial stages of digestion.

5. **Evaluating the Options**:
- **Stomach**: While food containing Ptyalin moves to the stomach, it is not secreted there. Therefore, this option is incorrect.
- **Salivary Gland**: This is the correct answer, as Ptyalin is secreted by the salivary glands.
- **Pancreas**: The pancreas secretes other enzymes, but not Ptyalin. Thus, this option is incorrect.
- **Bile Alkali**: Bile is related to fat digestion and does not secrete Ptyalin. Therefore, this option is also incorrect.

6. **Conclusion**: The correct answer to the question is that Ptyalin is secreted by the **salivary glands**.