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Antigens and Innate Immunity

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Questions and Answers

Which characteristic distinguishes innate immunity from adaptive immunity?

Specificity in recognizing a diverse range of antigens through gene rearrangement.
Nonspecific defense mechanisms present from birth, offering immediate protection. (correct)
The ability to generate immunological memory after encountering an antigen.
The involvement of T and B lymphocytes in targeted immune responses.

An antigen is best described as:

A type of immune cell that directly attacks pathogens.
Any substance capable of eliciting an immune response. (correct)
A barrier, such as skin, that prevents pathogen entry.
A protein produced by the body to neutralize toxins.

If a person lacks innate immunity, which of the following would be the most likely consequence?

Inability to produce antibodies in response to vaccination.
Increased susceptibility to infections from birth. (correct)
A hyperactive inflammatory response to common allergens.
Development of autoimmune disorders due to self-attack.

What is the key difference between an antigen and a pathogen regarding their role in the immune system?

<p>Antigens trigger immune responses, while pathogens are agents that cause disease. (D)</p> Signup and view all the answers

Why is the genetically based nature of innate immunity significant for offspring?

<p>It provides offspring with immediate, nonspecific protection from birth. (A)</p> Signup and view all the answers

Flashcards

Antigen

A substance that triggers an immune response.

Immune Response

The reaction of the immune system to an antigen.

Innate Immunity

Nonspecific immunity a person is born with.

Nonspecific Immunity

Immune response that does not target specific pathogens.

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Genetically Based Immunity

Immunity passed from parents to children through genes.

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Study Notes

Antigens

Antigens are substances that trigger an immune response.
These can include viruses, bacteria, or foreign objects inappropriately located in the body.

Innate Immunity

Innate immunity is present from birth.
It is non-specific.
This system is genetically determined and passed down through inheritance.

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Description

Learn about antigens and the innate immune system. Antigens are substances that trigger an immune response, while innate immunity is present from birth and non-specific. This system is genetically determined and passed down through inheritance.