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You can think of the lymphatic system as a second circulatory system. Instead of having blood pumped through its vessels, the lymph vascular system is filled with lymph and is a bit more passive.
EXAMPLE
When blood pumps through capillaries, some fluid leaks out of capillaries and lubricates our bodily tissues. This only goes one way; it's like squeezing water out of a sponge. If the fluid isn't eventually returned to the circulatory system, the blood will become too thick (just like a wrung-out sponge gets too dry) and our tissues will be under the pressure of too much surrounding fluid.The lymphatic system also works with the body’s immune system. Various structures within the lymphatic system help play a role in the body's defense.
Source: THIS WORK IS ADAPTED FROM SOPHIA AUTHOR AMANDA SODERLIND