👉 Lymphatic system is a system of blood vessels that carries lymph, a fluid that contains white and red cells. This system plays an important role in the immune system by allowing the body to fight off infections and diseases. The lymphatic system is divided into two main parts: the pericardial lymphatic system (which includes the right and left heart) and the perithecoid (or umbilical) lymphatic system, which includes veins from the abdomen, pelvis, and