Lymphatic system

The lymphatic system is a system of vessels and organs that transport fluid and nutrients from the body back into the circulatory system. The lymphatic system begins with dead-end lymph capillaries which bring in interstitial fluid - nutrient rich fluid outside the circulatory system. Once inside the lymphatic vessels, the fluid is now lymph. The lymph is both actively and passively pumped back toward the heart, where it reenters the circulatory system.