BIO 105--Ch. 14 Lymphatic System and Immunity
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18 terms
Terms | Definitions |
|---|---|
 Purpose of Lymphatic System | 1. To return tissue fluid to the blood to maintain blood volume. 2. To protect the body against pathogens and other foreign material. |
| lymph | fluid originating in the organs and tissues of the body that is circulated through the lymph vessels |
| lymph vessels | vessels that receive lymph from the lymph capillaries and circulate it to the nodes |
| lymph nodes | Small mass of lymphatic tissue located along mucous membrane. They function as a cleanser of lymph as wells as a site of T and B cell activation. |
| lymph nodules | Capsule of connective tissue encloses each lymph node and subdivides it in to compartments of dense masses of lymphocytes and macrophages |
| spleen | An abdominal organ that is considered part of the immune system. The spleen has four functions: (1) it filters antigen from the blood (2) it is the site of B cell maturation, (3) it stores blood, and (4) it destroys old red blood cells. |
| thymus | The primary gland of the lymphatic system, located within the mediastinum; helps maintain the body's immune response by producing T lymphocytes |
| lymphocytes | two main classes of small lymphocyte—B lymphocytes (B cells) and T lymphocytes (T cells). |
| B cells | lymphocytes that produce antibodies |
| T cells | Lymphocytes that mature in the thymus gland. |
| cell-mediated immunity (cellular) | type of immunity produced by T cells that attack infected or abnormal body cells; does NOT involve antibodies; involves T cells and macrophages |
| humoral immunity (adaptive) | type of immunity that responds to foreign antigens through antibody-mediated immunity; involves T cells and B cells, macrophages |
| innate immunity | barriers (skin, HCL), defensive cells (leukocyte, etc.) chemical defenses (inflammation) |
| antibody | Protein produced by plasma cells (from B cells) to destroy antigens; also called immune globulins (IgA, IgM, IgE) or gamma globulins |
| antigen | chemical markers that identify cells |
| immunity | the body's ability to destroy pathogens or foreign material and to prevent further cases of infectious diseases |
| genetic immunity | resistance acquired by inherited traits |
| acquired immunity | involves antibodies; may be natural (gamma globulins) or artificial (vaccines) |
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