Definitions / Recently Added

This definition has not yet been approved by a moderator.

A transparent, slightly yellow fluid that carries lymphocytes, bathes the body tissues, and drains into the lymphatic vessels.

FK Reading Ease
42.9

FK Grade Level
High School
  • Flag
  • This definition has not yet been approved by a moderator.
    FK Reading Ease
    54.7

    FK Grade Level
    Middle School
  • Flag
  • This definition has not yet been approved by a moderator.

    A protein produced by cells that stimulates antivirus immune responses or alters the physical properties of immune cells.

    FK Reading Ease
    28.8

    FK Grade Level
    College
  • Flag
  • This definition has not yet been approved by a moderator.

    An immune system function that is inborn and provides an all-­purpose defense against invasion by microbes.

    FK Reading Ease
    40.3

    FK Grade Level
    High School
  • Flag
  • This definition has not yet been approved by a moderator.

    Redness, warmth, and swelling produced in response to infection; the result of increased blood flow and an influx of immune cells and their secretions.

    FK Reading Ease
    60.7

    FK Grade Level
    Middle School
  • Flag
  • This definition has not yet been approved by a moderator.

    An immune system reaction to “foreign” invaders such as microbes or allergens. Signs include redness, swelling, pain, or heat.

    FK Reading Ease
    54.7

    FK Grade Level
    Middle School
  • Flag
  • This definition has not yet been approved by a moderator.
    FK Reading Ease
    -1.3

    FK Grade Level
    College
  • Flag
  • This definition has not yet been approved by a moderator.

    One of a family of large protein molecules, also known as antibodies, produced by mature B cells (plasma cells).

    FK Reading Ease
    45.1

    FK Grade Level
    High School
  • Flag
  • This definition has not yet been approved by a moderator.

    Reaction of the immune system to foreign substances. Although normal immune responses are designed to protect the body from pathogens, immune dysregulation can damage normal cells and tissues, as in the case of autoimmune diseases.

    FK Reading Ease
    36.8

    FK Grade Level
    College
  • Flag
  • This definition has not yet been approved by a moderator.

    A protein on the surfaces of human cells that identifies the cells as “self” and, like MHC antigens, performs essential roles in immune responses. HLAs are used in laboratory tests to determine whether one person’s tissues are compatible with another person’s, and could be used in a transplant. HLAs are the human equivalent of MHC antigens; they are coded for by MHC genes.

    FK Reading Ease
    52.5

    FK Grade Level
    High School
  • Flag