Physiological barriers prevent microbial growth in our human body include all , except
a. Tears
b. Skin
c. Interferons
d. Saliva
e. Acid in stomach
f. Epithelium of urinogenital tract

Options

A. a, b, & f
B. a, d & e
C. c, e & f
D. b,c & f

Answer

To solve the question regarding which physiological barriers prevent microbial growth in the human body, we will analyze each option provided:

1. **Tears**: Tears contain lysozymes, which are enzymes that can break down bacterial cell walls, thus preventing microbial growth. Therefore, tears are considered a physiological barrier.

2. **Skin**: The skin acts as a physical barrier to pathogens. It prevents the entry of microbes into the body. Thus, skin is indeed a physiological barrier.

3. **Interferons**: Interferons are proteins produced by cells in response to viral infections. They help to inhibit viral replication and enhance the immune response. However, they are not classified as a physiological barrier in the same way as the other options.

4. **Saliva**: Saliva contains enzymes and antimicrobial substances that help to control microbial growth in the mouth. Therefore, saliva is also a physiological barrier.

5. **Acid in the stomach**: The acidic environment of the stomach (low pH) is hostile to many pathogens, thus serving as a significant physiological barrier.

6. **Epithelium of the urinogenital tract**: The epithelial lining of the urinogenital tract acts as a barrier to pathogens, preventing their entry into the body.

Now, let's summarize the analysis:

- **Tears**: Yes, physiological barrier.
- **Skin**: Yes, physiological barrier.
- **Interferons**: No, not a physiological barrier in this context.
- **Saliva**: Yes, physiological barrier.
- **Acid in stomach**: Yes, physiological barrier.
- **Epithelium of urinogenital tract**: Yes, physiological barrier.

From the analysis, the only option that does not qualify as a physiological barrier is **Interferons** (option c).

Thus, the answer to the question is **c. Interferons**.

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