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Lymphatic systems
Here is what I learned from the lymphatic system explained in 5 minutes video.
| Term/Question/Statement | Answer |
|---|---|
| Lymphatic Vessels | Absorb excess interstitial fluid and transport lymph to ducts that drain into veins. |
| Lymph nodes and lymphoid tissues in the thymus, spleen and tonsils produce | Lymphocytes which are WBC involved with immunity. |
| The functions of the lymphatic system include | Transporting interstitial fluid, transport absorbed fat from small intestines into the blood and through the use of lymphocytes provide immunological defense against disease causing agents. |
| Lymphatic Capillaries are | The smallest vessels of the lymphatic system, close ended tubes, and form vast networks in most of the organs in the body. |
| Walls of lymphatic capillaries are | Composed of endothelial cells with porous junctions so interstitial fluid, proteins, white blood cells, microorganisms and absorbed fat can easily enter. |
| Once fluid enters the lymphatic capillary it becomes | Lymph |
| Lymph capillaries merge, and the lymph contained is carried into larger lymphatic vessels known as | Lymph ducts |
| Lymph duct walls are | Similar to structure of vein walls with 3 layers and valves to prevent backflow. |
| Fluid movement within lymph ducts occur as a result of | peristaltic waves of contraction |
| The smooth muscle within the lymph ducts contains a pacemaker that | initiates action potentials associated with the entry of CA^2+ which stimulates contraction. |
| The activity of the pacemakers and peristaltic waves of contraction are increased in response to | Stretching of the vessel. |
| Lymph ducts eventually empty into either the | Thoracic duct or the right lymphatic duct. |
| The thoracic duct and the right lymphatic duct drain lymph into the | Left and right subclavian veins. |
| Interstitial fluid is formed by | filtration of plasma out of blood capillaries. |
| Once the ducts drain into the subclavian veins, | Interstitial fluid is returned back into the cardiovascular system. |
| Before interstitial fluid is returned into the cardiovascular system, they are filtered by | Lymph nodes |
| Lymph nodes contain | Phagocytic cells that help remove pathogens and germinal centers, which are sites of lymphocytic production. |
| The lymphoid organs are | The tonsils, thymus and spleen. |
| Lymphoid organs | contain germinal centers and serve as sites of lymphocyte production. |