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Non-specific host defence that exists pr...

Non-specific host defence that exists prior to the exposure of an antigen is called:

A

acquired immunity

B

passive immunity

C

innate immunity

D

active immunity

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for the type of non-specific host defense that is present before the body is exposed to any antigens. 2. **Identifying the Type of Immunity**: The answer to this question is "innate immunity." Innate immunity is the body's first line of defense and is present at birth, meaning it does not require prior exposure to an antigen to be activated. 3. **Types of Innate Immunity**: Innate immunity can be categorized into four main types: - **Physical Barriers**: These include the skin and body hair, which act as a barrier to prevent pathogens from entering the body. - **Physiological Barriers**: These involve internal mechanisms such as stomach acid (HCl) that help to break down food and kill pathogens. - **Cellular Barriers**: This includes various white blood cells (WBCs) such as neutrophils, lymphocytes, basophils, eosinophils, and monocytes that help in identifying and destroying pathogens. - **Cytokine Barrier**: This involves signaling molecules that mediate and regulate immunity, inflammation, and hematopoiesis. 4. **Conclusion**: Therefore, the non-specific host defense that exists prior to the exposure of an antigen is called **innate immunity**. ---
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for the type of non-specific host defense that is present before the body is exposed to any antigens. 2. **Identifying the Type of Immunity**: The answer to this question is "innate immunity." Innate immunity is the body's first line of defense and is present at birth, meaning it does not require prior exposure to an antigen to be activated. 3. **Types of Innate Immunity**: Innate immunity can be categorized into four main types: - **Physical Barriers**: These include the skin and body hair, which act as a barrier to prevent pathogens from entering the body. ...
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