Understanding Viruses and Immune System

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What is a virus?

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A virus is a microscopic infectious agent that can only replicate inside the living cells of an organism.

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What is the role of the viral envelope?

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To help the virus attach to host cells.

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What is a capsid?

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A capsid is the protein shell of a virus that protects its genetic material.

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What is the primary immune response?

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The initial response to the first exposure to an antigen.

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What are mast cells?

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Mast cells are immune cells that release chemicals in response to physical injury.

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What is the difference between active and passive immunity?

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Active immunity involves the body's own immune response, while passive immunity is acquired from another individual.

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What are neutrophils?

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Neutrophils are a type of white blood cell that helps fight infections by engulfing pathogens.

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What is an antigen?

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An antigen is a substance that triggers an immune response, often found on the surface of pathogens.

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What is the function of antibodies?

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Antibodies are proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses.

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What is herd immunity?

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Herd immunity occurs when a large percentage of a population becomes immune to a disease, making its spread unlikely.