What does the lymphatic system primarily do?

The lymphatic system primarily functions to drain interstitial fluid, which is the fluid that surrounds tissue cells. This fluid accumulates as a result of the normal metabolic activities of cells and must be recycled back into the bloodstream to maintain fluid balance within the body. The lymphatic vessels, which are a crucial component of the lymphatic system, collect this excess fluid and transport it back to the circulatory system, thereby preventing swelling and maintaining homeostasis.

In addition to fluid drainage, the lymphatic system plays a significant role in immune function by transporting lymph, which contains lymphocytes and other immune cells. This is critical for the body’s defense against infections and diseases. Overall, the ability of the lymphatic system to effectively drain interstitial fluid is central to its role in maintaining the body’s internal environment and supporting the immune response.