The immune system when works against self cells it is called

Options

A. Self immune system
B. Autoimmunity
C. Specific immunity
D. None of the above

Answer

To solve the question "The immune system when works against self cells it is called," we need to analyze the options provided and understand the concept of the immune system's functioning.

### Step-by-Step Solution:

1. **Understand the Immune System**: The immune system is the body's defense mechanism that protects against foreign invaders, such as pathogens (bacteria, viruses, etc.). These foreign invaders are recognized as non-self cells.

**Hint**: Remember that the immune system distinguishes between self (the body’s own cells) and non-self (foreign invaders).

2. **Identify the Problem**: In certain pathological conditions, the immune system mistakenly attacks the body’s own cells, which are referred to as self cells. This is a failure of the immune system to recognize self from non-self.

**Hint**: Consider what happens when the immune system fails to recognize its own cells.

3. **Define Autoimmunity**: The condition where the immune system attacks self cells is known as autoimmunity. This occurs when the immune system loses its ability to differentiate between self and non-self.

**Hint**: Think about the prefix "auto-" which often refers to "self."

4. **Evaluate the Options**:
- **Self Immune System**: This term is not commonly used in immunology and is incorrect.
- **Autoimmunity**: This is the correct term for the immune system attacking self cells.
- **Defense Immunity**: This does not specifically refer to the attack on self cells and is incorrect.
- **None of the Above**: Since we have identified a correct option, this is also incorrect.

5. **Conclusion**: The correct answer to the question is **autoimmunity**.

### Final Answer:
The immune system when works against self cells is called **autoimmunity**.