Which substance of saliva destroy the harmful bacteria -

Options

A. Cerumin
B. Chyme
C. Lysozyme
D. Secretin

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks which substance in saliva destroys harmful bacteria.

2. **Understand the Components of Saliva**: Saliva contains various substances, including enzymes, electrolytes, and mucus. One of the key enzymes present in saliva is lysozyme.

3. **Define Lysozyme**: Lysozyme is an enzyme that has antibacterial properties. It works by breaking down the cell walls of certain bacteria, leading to their destruction.

4. **Conclusion**: The substance in saliva that destroys harmful bacteria is lysozyme.

5. **Additional Information**: The pH of saliva is approximately 6.8, which is slightly acidic. This environment is conducive for the action of lysozyme.

6. **Clarification of Other Terms**: The transcript mentions cerumen (earwax) and secretin (a hormone), but these are not related to the antibacterial properties of saliva.

**Final Answer**: The substance in saliva that destroys harmful bacteria is lysozyme.

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