An autoantigen is ____________  .


a. an antigen from normal microbiota
b. a normal body component
c. an artificial antigen
d. any carbohydrate antigen
e. nucleic acid

Verified step by step guidance

1. Understand the term 'autoantigen'.
2. Recognize that 'auto' refers to 'self'.
3. Consider that an autoantigen is an antigen that originates from the host's own body.
4. Eliminate options that do not align with the concept of 'self', such as those involving external sources or artificial origins.
5. Identify the option that describes a normal body component as the correct choice.

Key Concepts

Autoantigens

Autoantigens are molecules produced by the body that can trigger an immune response against the body's own tissues. They are typically normal components of the body, such as proteins or carbohydrates, that the immune system mistakenly identifies as foreign, leading to autoimmune diseases.

Normal Body Components

Normal body components refer to the molecules and structures that are naturally present in the body, including proteins, lipids, and nucleic acids. These components are essential for normal physiological functions, but when recognized as antigens by the immune system, they can lead to autoimmune reactions.

Immune Response

The immune response is the body's defense mechanism against foreign substances, including pathogens and antigens. It involves the activation of immune cells and the production of antibodies, which can sometimes mistakenly target autoantigens, resulting in tissue damage and autoimmune disorders.