Innate immunity is a non-specific type of defense and consists of four types of barriers. Categorise the barriers and give one example of each.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Innate Immunity**:
- Innate immunity is the body's first line of defense against pathogens and is present from birth. It is a non-specific type of immunity, meaning it does not target specific pathogens but rather provides a general defense against all types of invading organisms.

2. **Categories of Innate Immunity Barriers**:
- Innate immunity consists of four main types of barriers: physical barriers, physiological barriers, cellular barriers, and cytokine barriers.

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