Lymphatic System - Tasks

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Lymphatic System - Tasks
Lymphatic System - Tasks
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Video: Lymphatic System: Crash Course A&P #44 2023, February

Lymphatic system: what is it?

The lymphatic system fulfills many important functions in the organism: It functions as a transport system and plays an important role in the body's defense mechanisms. The lymphatic system includes the lymph, the lymph capillaries, larger lymph vessels, the lymph nodes, the spleen, the tonsils (tonsils) and the thymus.


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The lymph vessels transport up to two liters of yellowish-white intercellular fluid into the venous system every day. With this so-called lymph, dead cells, protein and foreign bodies, bacteria, fats and metabolic end products are removed. In contrast to the blood vessel system, which forms a closed circuit with the heart, the lymph capillaries are single-lane structures with open vessels at the ends that run through the whole body.

The path of the lymphatic vessels is interrupted by more than 100 lentil- to bean-sized lymph nodes. They filter out microorganisms and toxic substances and destroy them - so they have a cleaning function. When infected, lymph nodes can swell and hurt.

The lymphocytes, which play an important role in the immune defense, are mainly formed in the bone marrow and, to a lesser extent, in the spleen. The spleen also removes old red blood cells (erythrocytes) from the blood and acts as a blood reservoir. In the newborn, the thymus is located below the thyroid gland behind the breastbone. It is responsible for the development of the immune system in childhood and also produces lymphocytes. Later it gradually regresses until it finally withers away in adulthood.

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