The saliva in the mouth and the tears from the eyes will be included under which category of innate immunity?

Options

A. Physiological barrier
B. Physical barrier
C. Cytokine barrier
D. Cellular barrier

Answer

To solve the question regarding the classification of saliva and tears in the context of innate immunity, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Innate Immunity**: Innate immunity is the body's first line of defense against pathogens and includes various physical, physiological, and cellular components.

2. **Identifying Components**: The question specifically mentions saliva and tears. We need to categorize these components based on their function in innate immunity.

3. **Analyzing Saliva and Tears**:
- **Saliva**: Contains enzymes like lysozyme that help break down bacteria and prevent microbial growth.
- **Tears**: Also contain lysozyme and other antimicrobial substances that protect the eyes from infections.

4. **Categorizing the Components**:
- **Physiological Barriers**: These include bodily fluids that have antimicrobial properties, such as saliva and tears.
- **Physical Barriers**: These refer to structures like skin that physically block pathogens.
- **Cytokines**: These are signaling molecules that mediate and regulate immunity and inflammation.
- **Cellular Barriers**: This refers to immune cells that respond to pathogens.

5. **Conclusion**: Since both saliva and tears function primarily through their biochemical properties to prevent infection, they are classified under **physiological barriers** of innate immunity.

### Final Answer:
The saliva in the mouth and the tears from the eyes will be included under **A) physiological barrier**.

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