The Lymphatic System and Manual Lymphatic Massage-What is it? Your lymphatic system is a part of the circulatory system. With every beat of the heart, oxygen, and nutrients flow through blood to the body. A part of the plasma stays behind and becomes the lymphatic fluid. This fluid is a viscus protein which absorbs dead cells, bacteria, and foreign matter. It then moves into the lymphatic vascular system in the body. The vessels move from within the body to the skin, through