The heart is made up of a single ventricle in which arterial and venous blood mix only partially. The left and right auricles are distinct in lunged forms but are not completely separate in the perennibranchiates. Although it differs in between species, there are usually from 30,000-100,000 red blood cells per cubic millimeter of blood. This number increases when the environmental conditions prevent the blood from being oxygenated enough. Salamanders have a fairly well developed lymphatic system.
Lymph hearts are heart-like structures that help the lymphatic circulation.
I hope my intensely researched report has been interesting and informing. If you were awake through its entirety then I'm pretty sure that it was at least intellectually stimulating, unless you happen to have a Ph.d. 44 Issue 4 Environment, Dec. 93, Vol.