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| 9089870661 | innate immunity | a first line of defense against potential invaders | 0 | |
| 9089870662 | phagocytosis | engulfing and destroying foreign substances by forming a vacuole that fuses with a lysosome | 1 | |
| 9089870663 | neutrophils | an innate, defensive, phagocytic white blood cell that can engulf bacteria and viruses in infected tissue | 2 | |
| 9089870664 | macrophages | a large amoeboid, phagocytic white blood cell that functions in innate immunity by destroying microbes and in acquired immunity as an antigen-presenting cell | 3 | |
| 9089870665 | natural killer cells | a cell type that provides an innate immune response by attacking cancer cells and infected body cells, especially those harboring viruses | 4 | |
| 9089870667 | complement system | a family of innate defensive blood proteins that cooperate with other components of the vertebrate defense system to protect against microbes | 5 | |
| 9089870668 | inflammatory response | an innate body defense in vertebrates caused by a release of histamine and other chemical alarm signals that trigger increased blood flow, a local increase in white blood cells, and fluid leakage from the blood | 6 | |
| 9089870669 | histamine | a chemical alarm signal released by injured cells of vertebrates that causes blood vessels to dilate during an inflammatory response | 7 | |
| 9089870670 | lymphatic system | the vertebrate organ system through which lymph circulates | 8 | |
| 9089870672 | acquired immunity | the kind of defense that is mediated by B lymphocytes and T lymphocytes | 9 | |
| 9089870673 | antigen | a foreign molecule that elicits an acquired immune response | 10 | |
| 9089870674 | antibody | a protein dissolved in blood plasma that attaches to a specific kind of antigen and helps counter its effects | 11 | |
| 9089870675 | vaccination | a procedure that presents the immune system with a harmless variant or derivative of a pathogen | 12 | |
| 9089870677 | active immunity | immunity conferred by recovering from an infectious disease or by receiving a vaccine | 13 | |
| 9089870678 | passive immunity | temporary immunity obtained by acquiring ready-made antibodies (like through breast milk) | 14 | |
| 9089870679 | lymphocytes | a type of white blood cell that is chiefly responsible for the acquired immune response | 15 | |
| 9089870680 | B cells | a type of lymphocyte that matures in the bone marrow and later produces antibodies | 16 | |
| 9089870681 | T cells | a type of lymphocyte that matures in the thymus and is responsible for the cell-mediated immune response | 17 | |
| 9089870682 | humoral immune response | the type of specific immunity brought about by antibody producing B cells | 18 | |
| 9089870683 | cell-mediated immune response | the type of specific immunity brought about by T cells | 19 | |
| 9089870684 | antigen receptors | a transmembrane version of an antibody molecule that B cells and T cells use to recognize specific antigens | 20 | |
| 9089870688 | plasma cells | an antibody-secreting B cell (like a factory churning out copies) | 21 | |
| 9089870689 | memory cells | a clone of long-lived lymphocytes formed during the primary immune response | 22 | |
| 9089870690 | primary immune response | the initial immune response to an antigen, which appears after a lag of several days | 23 | |
| 9089870691 | secondary immune response | the immune response elicited when an animal encounters the same antigen at some later time | 24 | |
| 9089870692 | antigen-binding site | a region of the antibody molecule responsible for the antibody's recognition and binding function | 25 | |
| 9089870694 | cytotoxic T cells | a type of lymphocyte that attacks body cells infected with pathogens | 26 | |
| 9089870695 | helper T cells | a type of lymphocyte that helps activate other types of T cells and may help stimulate B cells to produce antibodies | 27 | |
| 9089870696 | antigen-presenting cells | one of a family of white blood cells that ingests a foreign substance or a microbe and attaches antigenic portions of the ingested material to its own surface, thereby displaying the antigens to a helper T cell | 28 | |
| 9089870697 | self protein | a protein on the surface of an antigen-presenting cell that can hold a foreign antigen and display it to helper T cells | 29 | |
| 9089870700 | HIV | Human immunodeficiency virus; the retrovirus that attacks the human immune system and causes AIDS | 30 | |
| 9089870701 | autoimmune diseases | when the immune system turns against some of the body's own molecules, may be due to the body not editing/maturing T cells correctly in response to an infection, somewhat genetically based | 31 | |
| 9089870702 | immunodeficiency diseases | an immunological disorder in which the immune system locks one or more components, making the body susceptible to infectious agents that would ordinarily not be pathogenic | 32 | |
| 9089870703 | allergies | hyper-sensitive responses to antigens in our surroundings | 33 | |
| 9089870707 | anaphylactic shock | an especially dangerous type of allergic reaction | 34 | |
| 9089940524 | major histocompatibility complex (MHC) | a set of cell surface proteins essential for the acquired immune system to recognize foreign molecules in vertebrates (shows "self") | 35 |
