#Lymphatic system. Animated video tour of the #lymph and lymphatic system. The lymphatic system is considered part of the circulatory system because it is formed by the lymphatic vessels. Carry a fluid called lymph, which comes from the blood, has a very similar to the composition and returns it to her. This system is therefore the second network transport body fluids. The lymphatic system serves four basic functions: - Maintaining the osmolar balance in the "third space". - Contributes main for