Tears from eyes and interferons are included under which of the following barriers ?

Options

A. Physiological and physical
B. Physical and cytokine
C. Physiological and cytokine
D. Cellular and cytokine

Answer

To solve the question about tears from the eyes and interferons, we need to categorize them into the correct type of barriers. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Types of Barriers
We need to know the different types of barriers in the immune system. The two main categories are:
- **Physical Barriers**: These include the skin and mucous membranes that act as the first line of defense.
- **Physiological Barriers**: These include internal mechanisms such as tears, saliva, and other secretions that help protect the body.
- **Cytokine Barriers**: These involve signaling proteins like interferons that play a role in the immune response.

### Step 2: Analyze the Components
- **Tears**: Tears contain enzymes such as lysozyme, which can break down bacterial cell walls, thus providing a protective mechanism. This places tears under physiological barriers.
- **Interferons**: These are proteins produced by cells in response to viral infections and are part of the immune response, classifying them under cytokine barriers.

### Step 3: Evaluate the Options
Now, we will evaluate the provided options:
- **Option A: Physiological and Physical** - This is incorrect because tears are physiological, but not physical.
- **Option B: Physical and Cytokine** - This is incorrect as tears are not physical barriers.
- **Option C: Physiological and Cytokine** - This is correct because tears are physiological barriers and interferons are cytokines.
- **Option D: Cellular and Cytokine** - This is incorrect as it does not accurately describe the nature of tears and interferons.

### Conclusion
The correct answer is **Option C: Physiological and Cytokine**.

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