blood, lymph, and immune system keyterms

protective protein produced by B lymphocytes in response to the presence of a foreign substance called antigen

immunoglobulins (Igs)

substance, recognized as harmful to the host, that stimulates formation of antibodies in an immunocompetent individual

substance derived from the breakdown of hemoglobin and excreted by the liver

jaundice

chemical substance produced by certain cells that initiates, inhibits, increases, or decreases activity in other cells

immune response

immunity and inflammation

ability to develop an immune response or recognize antigens and respond to them

specialized lymphocytes that kill abnormal cells by releasing chemicals that destroy the cell membrane, causing its intercellular fluids to leak out

virally infected cells and tumor cells