1. Immune System: This is the primary defense. Your immune system uses various strategies to fight off microbes:
* White blood cells: These cells identify and destroy harmful microbes through phagocytosis (engulfing and digesting), or by producing antibodies that target specific microbes.
* Inflammation: This process brings immune cells to the infected area, increasing blood flow and causing swelling, redness, and pain to help fight off the infection.
* Fever: This can slow down the growth of some microbes and increase the activity of immune cells.
2. Physical Barriers: Your body has natural barriers that prevent microbes from entering:
* Skin: The outer layer of your skin is a tough barrier that microbes have trouble penetrating.
* Mucous Membranes: These line your respiratory, digestive, and urinary tracts and produce mucus, a sticky substance that traps microbes and prevents them from entering the body.
* Cilia: Tiny hair-like structures that line your respiratory system, sweep mucus and trapped microbes upwards so they can be coughed or sneezed out.
These are just two of the many ways your body defends itself. Your body is a complex system that constantly works to keep you healthy!
