- Lymph hearts are organs found in some animals which pump lymph.
- Lymph hearts are found in lungfishes, all amphibians, reptiles and flightless birds.
- In animals lower than mammals, these vessels have lymph hearts, which possess stretch receptors and smooth muscle tissue embedded in their walls.
- Unlike the cardiovascular system, the lymphatic system is not closed and has no central pump, or lymph hearts ( which are found in some animals ).
- It has been suggested that the edema that occurs in some people following use of aspirin-like cyclo-oxygenase inhibitors such as ibuprofen or indomethacin may be due to inhibition of lymph heart action.