| A | B |
| Interstitial fluid | plasma that flows out of the capillaries into spaces between the cells |
| Lymph | removes cellular waste products and dead blood cells from the tissues |
| Tonsils | masses of lymphatic tissue that form a protective ring around the nose and upper throat |
| Adenoids | nasopharyngeal tonsils |
| Vermiform appendix | lymphatic tissue that hangs from the lower portion of the cecum of the large intestine |
| Peyers Patches | small bundles of lymphatic tissue located on the walls of the ileum |
| Spleen | a saclike mass of lymphatic tissue located in the left upper quadrant of the abdomen and filters foreign material from the blood |
| Lymphedema | swelling due to an abnormal accumulation of lymph within the tissues |
| Primary lymphedema | a hereditary disorder that may appear any time in life and mostly affects the legs |
| Secondary lymphedema | caused by cancer treatment |
| Antigen | any substance that the body regards as being foreign |
| Antibody | a disease fighting protein created by the immune system in response to the presence of a specific antigen |
| B Cells | lymphocytes that produce and secrete antibodies |
| T Cells | small lymphocytes the coordinate immune defenses and kill infected cells on contact |
| Interferon | produced by t cells |
| Lymphokines | produced by t cells |
| Macrophange | protects the body by eating invading cells and by interacting with the other cells of the immune system |
| Phagocyte | a large white blood cell that can eat and destroy cell debris |