What is the primary function of the lymphatic system?

The primary function of the lymphatic system is to transport hormones and proteins from cells to the bloodstream. This system plays a crucial role in maintaining fluid balance within the body by returning interstitial fluid, which is the fluid that exists between cells, back into circulation. Lymph also carries white blood cells that are essential for the immune response. When fluids and proteins leak out of blood vessels, the lymphatic system absorbs them and eventually makes their way back to the bloodstream, ensuring that the body's tissues are appropriately nourished and that the immune system is kept alert to potential threats like infections and diseases.

While transporting red blood cells, filtering toxins from the blood, and circulating oxygen are essential functions, these tasks are primarily associated with other systems in the body, such as the circulatory and respiratory systems. The lymphatic system's unique function in fluid balance and immune support is what distinguishes it from these other systems.