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chpt 20
| Question | Answer |
|---|---|
| Lymphatic System | Consists of three parts A network of lymphatic vessels (lymphatics) Lymph fluid Lymph nodes |
| What are the functions of lympathetic system | Returns interstitial fluid and leaked plasma proteins back to the blood. Once interstitial fluid enters lymphatics, it is called lymph |
| Together with lymphoid organs and tissues, provide the structural basis of the | immune system |
| lympathetic vessels are one way systems that | lymph flows toward the heart only. |
| Lymph vessels (lymphatics) include | Lymphatic capillaries Lymphatic collecting vessels Lymphatic trunks and ducts Collecting vessels > Trunks (J – BILS) > RT Lymph Duct & Thoracic Duct. |
| Similar to blood capillaries, except Very permeable (take up cell debris, pathogens, and cancer cells) | Lymphatic Capillaries |
| Any increase in Interstitial pressure forces the valves | open |
| Any increase in lymphatic pressure forces the valves | closed |
| Lymphatic Capillaries are | Are present in the CNS as of 2015 |
| specialized lymph capillaries present in intestinal mucosa Absorb digested fat and deliver fatty lymph (chyle) to the blood | Lacteals |
| Similar to veins, have 3 tunics, except Have thinner walls. More internal valves Anastomose more frequently | Lymphatic Collecting Vessels |
| Collecting vessels in the skin travel with | superficial veins |
| Deep vessels travel with | arteries |
| Nutrients are supplied from branching | vasa vasorum |
| Formed by the union of the largest collecting ducts | Collecting….Trunks…..Ducts |
| drains the right upper arm and the right side of the head and thorax | Right lymphatic duct |
| arises from the cisterna chyli and drains the rest of the body | Thoracic duct |
| Each empties lymph into venous circulation at the junction of the internal jugular and | subclavian veins |
| Lymph is propelled by | Pulsations of nearby arteries Contractions of smooth muscle in the walls of the lymphatics |
| Lymph vessels are | low pressure |
| Return excess fluid & protein to bloodstream | Lymph |
| Carry absorbed fats from intestine to bloodstream | Lymph |
| the main warriors of the immune system | Lymphocytes |
| Manage the immune response Attack & destroy invaders. | T cells (T lymphocytes |
| Produce plasma cells that make antibodies. Antibodies mark antigens. Both are immunocompetent. | B cells (B lymphocytes) |
Created by:
jennysevere24