Which is the first enzyme to mix with food in the digestive tract ?

Options

A. Pepsin
B. Cellulase
C. Amylase
D. Trypsin

Explanation

**Step-by-Step Solution:**

1. **Understanding Digestion**: Digestion is the process by which food is broken down into smaller components that can be absorbed by the body. This process begins in the mouth.

2. **Location of Initial Digestion**: The first site of digestion in the alimentary canal is the mouth. Here, food is mechanically broken down by chewing and mixed with saliva.

3. **Role of Salivary Glands**: The mouth contains salivary glands that produce saliva. Saliva contains enzymes that aid in digestion.

4. **Identifying the First Enzyme**: The key enzyme present in saliva is salivary amylase. This enzyme is responsible for breaking down starch into simpler sugars.

5. **Comparing Other Enzymes**: Other enzymes mentioned in the options include pepsin, cellulase, and trypsin:
- **Pepsin**: Works in the stomach to digest proteins.
- **Trypsin**: Functions in the small intestine, also for protein digestion.
- **Cellulase**: Not produced by humans; it helps in digesting cellulose in ruminants.

6. **Conclusion**: Since salivary amylase is the first enzyme to mix with food in the digestive tract, it is the correct answer.

**Final Answer**: The first enzyme to mix with food in the digestive tract is **salivary amylase**.

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