The lymphatic system and the cardiovascular system are closely related structures that are joined by a capillary system. It is also important for the distribution of fluids and nutrients in the body because it drains excess fluids and protein so that tissues do not swell up. "Lymph" is a milky body fluid that contains a type of white blood cells, called "lymphocytes" along with proteins and fats. Lymph seeps outside the blood vessels in spaces of body tissues and is stored in the lymphatic system to flow back into the bloodstream. Through the flow of blood in and out of arteries, and into the veins, and through the lymph nodes and into the lymph, the body is able to eliminate the products of cellular breakdown.

- The lymphatic system aids the immune system in filtering waste so that the lymph can be safely returned to the circulatory system.

- The normal lymphatic system removes excess fluid, waste, debris, dead blood cells, abnormal cells, and toxins from these cells and the tissue spaces between them.

- The lymphatic system also works with the circulatory system to deliver nutrients, oxygen, and hormones from the blood to the cells that make up the tissues of the body.

- Important protein molecules are created by cells in the tissues.