What is immunity?

• A. The bodies ability to destroy infection agents that enter the body.
• B. The body's ability to detoxify chemicals.
• C. The body's ability to heal broken bones.
• D. The body's ability to digest fats.

Answer: (A)

Immunity is the body's defense system that recognizes and fights off invaders like bacteria, viruses, and other pathogens. It includes barriers such as the skin, and immune cells and molecules (like white blood cells and antibodies) that respond to infections. The system can respond quickly to repeated threats because it can “remember” past invaders, a feature vaccines use to train the body.

This is different from detoxification (the liver removing toxins), healing bones (repairing tissue), or digesting fats (breaking down nutrients). Immunity specifically focuses on preventing and fighting infections.