IgA

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Definition

Noun: 1. Immunoglobulin A: One of the five primary classes of antibodies (immunoglobulins) found in the immune system. It is the predominant antibody present in mucous membrane secretions, such as those lining the gastrointestinal tract, respiratory tract, and urogenital tract, serving as a first line of defense against pathogens.

Usage
  • iga is a specialized scientific and medical term. It is typically used in contexts related to immunology, medicine, and health.
  • It is often discussed in terms of its levels (e.g., "low IgA," "elevated IgA"), its role in specific body systems, or in relation to medical conditions (e.g., "IgA deficiency," "IgA nephropathy").
Examples
  • Noun:
    • The doctor ordered a test to measure the patient's serum IgA levels.
    • IgA is crucial for immune protection at mucosal surfaces like the gut lining.
    • Selective IgA deficiency is one of the most common primary immunodeficiencies.
Advanced Usage
  • Secretory IgA (sIgA): This is the form of IgA found in bodily secretions like saliva, tears, and breast milk. It is a dimer (two IgA molecules joined) that is more resistant to enzymatic breakdown.
    • Breast milk is rich in secretory IgA, which helps protect the infant's gut.
Variants and Related Words
  • Immunoglobulin: The general term for all antibody classes, including IgA, IgG, IgM, IgE, and IgD.
  • Antibody: A protein produced by the immune system to identify and neutralize foreign objects like bacteria and viruses; IgA is a type of antibody.
Synonyms
  • Immunoglobulin A (The full, formal name).
  • Mucosal antibody (A descriptive term highlighting its primary location and function).
Notes on Meaning

The term iga has a single, specific meaning in biology and medicine. It does not have different general meanings, idioms, or phrasal verbs associated with it, as it is a technical noun referring to a specific biological molecule.

Noun
  1. one of the most common of the five major classes of immunoglobulins; the chief antibody in the membranes of the gastrointestinal and respiratory tracts

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