Patho Patho #16

Question

The nurse recognizes which as the primary initial defense against antigens that invade the body?

Answers

  1. IgM
    • Rationale:

      This answer choice is correct because IgM is involved in the primary response to invading antigens.

  2. IgG
    • Rationale:

      This answer choice is not correct because IgG is involved in the secondary immune response to invading antigens/

  3. IgA
    • Rationale:

      This answer choice is not correct as IgA serves to prevent the passage of infectious molecules into the circulatory system. IgA is present in mucous membranes and saliva.

  4. IgD
    • Rationale:

      This answer choice is not correct because the primary function of IgD is to send activation signals to B cells when an invading antigen is present.

Overview

Immunoglobulins comprise the body’s humoral defense against antigens. Immunoglobulins are also known as antibodies and are small proteins present within the serum which . Immunoglobulins, recognize and bind to specific antigens to aid in the destruction of invading microorganisms such as bacteria or viruses. IgM is the primary immunoglobulin involved in this immune reaction to invading antigens.

Explanation

Learning Outcomes

Humoral immunity, or B-cell immunity, works by remembering invading antigens and secreting the appropriate antibodies to attack and destroy invading microorganisms. Immunoglobulins are part of humoral immunity. Each immunoglobulin serves a unique function but IgM is involved in the primary response to invading antigens.

Test Taking Tip

The two most commonly tested immunoglobulins are IgG and IgM. Remember that IgM has an “M” in it so it is the primary antibody involved in humoral immunity.

Video Rationale