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Lymphatic System
vocab
| Term | Definition |
|---|---|
| lymphatic system | the lymphatic vessels, and the lymphoid tissues and organs including lymph nodes. |
| edema | an abnormal accumulation of fluid in body parts or tissues; causes swelling. |
| lymphatic vessels | form an elaborate drainage system that picks up this excess tissue fluid and returns it to the blood. |
| lymph | the watery fluid in the lymph vessels collected from the tissue spaces |
| lymphatics | form a one-way system, and lymph flows only toward the heart. |
| lymph capillaries | weave between the tissue cells and blood capillaries in the loose connective tissues of the body, and absorb the leaked fluid |
| lymphatic collecting vessels | lymph is transported from the lymph capillaries through successively larger lymphatic vessels |
| right lymphatic duct | drains the lymph from the right arm and the right side of the head and thorax |
| thoracic duct | receives lymph from the rest of the body |
| lymph nodes | a mass of lymphatic tissue |
| macrophages | cell particularly abundant in lymphatic and connective tissues; important in the immune response as an antigen presenter to T cells and B cells. |
| lymphocytes | agranular white blood cells formed in the bone marrow that mature in the lymphoid tissue |
| cortex | the outer surface layer of an organ |
| follicles | collection of lymphocytes in a lymph node |
| germinal centers | dark-staining centers |
| medulla | the central portion of certain organs |
| afferent lymphatic vessels | lymph enters the convex side of a lymph node through this. |
| sinuses | a dilated channel for passage of blood or lymph |
| hilum | a depressed area where vessels enter and leave an organ |
| efferent lymphatic vessels | lymph exits from the node at its indented region, via this. |
| lymphoid organs | organs in the lymphatic system including lymph nodes, spleen and tonsils |
| spleen | a soft, blood-rich organ that filters blood. |
| thymus | an endocrine gland active in the immune response |
| tonsils | small masses of lymphoid tissue that ring the pharynx, where they are found in the mucosa. |
| tonsillitis | tonsils that become congested with bacteria and become red, swollen, and sore. |
| Peyer's patches | resemble tonsils, are found in the wall of the distal part of the small intestine. |
| appendix | a wormlike extension of the large intestine. |
| mucosa-associated lymphoid tissue | Peyer's patches, the appendix, and the tonsils are part of the collection of small lymphoid tissue |
Created by:
lorettabritton
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