Immune System

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What is the immune system?

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The immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens such as bacteria, viruses, and parasites.

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What are antibodies?

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Antibodies are proteins produced by B cells of the immune system that specifically target and neutralize pathogens.

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What is a pathogen?

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A pathogen is any organism, such as a virus or bacteria, that can cause disease.

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What are the four main types of pathogens?

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The four main types of pathogens are bacteria, viruses, fungi, and parasites.

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What is an antigen?

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An antigen is a molecule located on the surface of a pathogen that is recognized by the immune system.

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What role do B cells play in the immune system?

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B cells are a type of white blood cell that produce antibodies to help identify and neutralize pathogens.

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What are T cells?

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T cells are a type of white blood cell that play a critical role in the immune response, including killing infected host cells and activating other immune cells.

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What is the function of phagocytes?

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Phagocytes are immune cells that engulf and digest pathogens and debris in the body.

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How do vaccines work?

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Vaccines stimulate the immune system to recognize and fight specific pathogens without causing the disease, often by introducing a harmless component of the pathogen.

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What is the difference between innate and adaptive immunity?

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Innate immunity is the body's first line of defense, providing immediate but non-specific protection, while adaptive immunity develops over time and provides specific responses to particular pathogens.