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The human immune system is a complex network of cells and proteins that work together to defend the body against harmful invaders, such as bacteria, viruses, and parasites. **_Immunity_** is the body's ability to resist these pathogens and toxins. The immune system consists of two main parts: the innate immune system and the adaptive immune system.
**1. Innate Immune System:** This is the body's first line of defense and provides immediate, nonspecific protection against pathogens. It includes physical barriers like the skin and mucous membranes, as well as white blood cells such as neutrophils and macrophages.
**2. Adaptive Immune System:** This system provides a targeted response to specific pathogens. It includes lymphocytes, such as T cells and B cells, which can recognize and remember specific antigens. This allows the body to mount a faster and more effective response upon repeated exposure to the same pathogen.
**_How does the immune system work?_** When a pathogen enters the body, the immune system identifies it as foreign and mounts an immune response. White blood cells engulf and destroy the invaders, while lymphocytes produce antibodies to neutralize them. Memory cells are then created to provide long-term immunity.
**_Boosting Immunity:_** Eating a balanced diet, getting enough sleep, exercising regularly, and reducing stress can all help support a healthy immune system.
**_Conclusion:_** The human immune system is a remarkable defense mechanism that protects the body from a wide range of threats. Understanding how it works can help us make informed choices to keep it strong and resilient.