In mammals the digestion of starch starts from

Options

A. Oesophagus from entry of air
B. Mouth
C. Stomach
D. Duodenum

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the digestion of starch begins in mammals.

2. **Identifying the Options**: The options provided are:
- Esophagus
- Mouth
- Stomach
- Duodenum

3. **Analyzing Each Option**:
- **Esophagus**: This is primarily a passageway for food to travel from the mouth to the stomach and does not play a role in digestion.
- **Mouth**: In the mouth, food is mechanically broken down by chewing, and saliva is secreted from the salivary glands.
- **Stomach**: The stomach is mainly involved in the digestion of proteins and does not initiate starch digestion.
- **Duodenum**: This is the first part of the small intestine, where further digestion occurs, but it is not the starting point for starch digestion.

4. **Focusing on the Mouth**: In the mouth, salivary glands secrete saliva, which contains the enzyme salivary amylase (also known as ptyalin). This enzyme begins the process of breaking down starch into simpler sugars.

5. **Conclusion**: Based on the analysis, the correct answer is that the digestion of starch in mammals starts in the **mouth**.

**Final Answer**: The digestion of starch starts from the **mouth**.

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