What pumps the lymphatic system?
Depends how you look at it. The lymphatic system has no direct pump the flow is im part due to its blindendedness. It takes up excess intersticial fluid the presence of which is continuously increasing and carries it back to to the vena cava. The fact that more of the fluid is always appearing pushes what is in the system along. On the other hand the intersticial fluid must be increasing for a reason, and indeed it is. The excess fluid plasma from the cappilary beds that is lost from the vascular system due o pressure and concentration gradients. So in a sense it could be argued that the heart is the pump for the lymphatic system but this is a tenuous link in my opinion.
