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Chapter 19 Vocabulary - Anatomy & Physiology

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  • Antigen

    A foreign substance that triggers an immune response.

  • Antibody

    A protein produced by B cells that binds to specific antigens.

  • Lymphocyte

    A type of white blood cell involved in adaptive immunity, including B and T cells.

  • Phagocytosis

    The process by which certain cells engulf and digest foreign particles or pathogens.

  • Macrophage

    A large phagocytic cell that ingests pathogens and presents antigens to lymphocytes.

  • T cell

    A lymphocyte that matures in the thymus and mediates cellular immunity.

  • B cell

    A lymphocyte that matures in bone marrow and produces antibodies.

  • Immunoglobulin

    Another term for antibody, a protein that recognizes antigens.

  • Complement system

    A group of proteins that enhance immune responses by promoting inflammation and cell lysis.

  • Memory cell

    A long-lived lymphocyte that remembers a specific antigen for faster response upon re-exposure.

  • Cytokine

    A signaling molecule that regulates immune cell communication and activity.

  • Antigen-presenting cell (APC)

    A cell that displays antigen fragments on its surface to activate T cells.

  • Innate immunity

    The body's nonspecific first line of defense against pathogens.

  • Adaptive immunity

    The specific immune response that develops after exposure to an antigen.

  • Autoimmune disease

    A condition where the immune system attacks the body's own tissues.

  • Vaccination

    The process of stimulating immunity by exposure to a harmless form of an antigen.

  • Hematopoiesis

    The process of blood cell formation in the bone marrow.

  • Lymph node

    A small organ that filters lymph and houses immune cells.

  • Spleen

    An organ that filters blood and helps fight infections.

  • Inflammation

    The body's response to injury or infection, characterized by redness, heat, swelling, and pain.