The lymphatic system is a vital part of the body and plays a key role in protecting health. It is one of the first systems to confront and fight harmful microorganisms. It also helps  transport nutrients, remove toxins, waste, harmful byproducts and return excess fluid to the bloodstream. Strong immunity depends heavily on how well the lymphatic system functions - the healthier it is, the better the body can resist and eliminate invading pathogens.​​​

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The human lymphatic system carries out essential functions that are necessary for maintaining health, energy, and overall well-being. These key functions include:

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Protection
Lymph nodes contain special tissue that produces important immune cells such as lymphocytes, phagocytes, and antibodies. These cells help the body recognise and fight infections.

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Filtration
The lymphatic system acts as a filter, trapping and removing foreign particles and harmful substances that enter the lymph fluid.

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Humoral (Signaling) Function
Because the lymphatic system extends through most of the body, it helps transport signaling molecules between organs and tissues. This communication supports the production of biologically active substances needed for a proper immune response.

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Transport
Lymph fluid carries liquids, nutrients, and other substances that cannot directly enter the bloodstream. For example, fats absorbed in the intestine are delivered to the blood through the lymphatic system. It also returns a significant amount of proteins to the bloodstream each day - losses the body could not easily replace.

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Drainage
The lymphatic system removes excess fluid from body tissues, helping prevent swelling (edema). This function may go unnoticed when working properly, but if it is disrupted, fluid can build up and cause severe swelling that may even limit movement.