The immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens like bacteria, viruses, and parasites. It distinguishes between self and non-self entities, activating a response to neutralize or eliminate potential threats while maintaining tolerance to the body's own cells.

Immune System Function

The immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens and maintain overall health. It involves both innate and adaptive responses, which recognize and neutralize foreign invaders while also retaining memory for faster future responses.

immune system

complex network

cells

tissues

organs

defend the body

harmful pathogens

Bacteria are single-celled microorganisms that exist in diverse environments and play crucial roles in processes such as nutrient cycling, fermentation, and as pathogens. They reproduce rapidly through binary fission and can acquire genetic material from other organisms, contributing to their adaptability and evolution.

bacteria

Viruses are microscopic infectious agents that can only replicate inside the living cells of an organism. They are known for causing a wide range of diseases in humans, animals, and plants, and are characterized by their simple structure, consisting of genetic material (DNA or RNA) surrounded by a protein coat.

viruses

Parasites are tiny living things that live on or inside other living things, like animals or plants, and use them to get food and a safe place to live. They can sometimes make the animals or plants they live on feel sick or not grow well.

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