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# Why is** immune system **essential for our health?

The immune system of our body is a kind of

**defense mechanism to fight against pathogenic microbes.**It has cells that are specialized to kill infecting microbes and keep our bodies healthy. It produces antibodies to kill the harmful pathogen known as the antigen.- Related Articles
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- From an external point \( P \), tangents \( P A=P B \) are drawn to a circle with centre \( O \). If \( \angle P A B=50^{\circ} \), then find \( \angle A O B \).
- Two tangent segments \( P A \) and \( P B \) are drawn to a circle with centre \( O \) such that \( \angle A P B=120^{\circ} . \) Prove that \( O P=2 A P \).
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