By "receiving chambers," I'm not sure if you mean the right atrium and left atrium or the right and left ventricles because those are also chambers within the heart that receive blood in the blood flow cycle.
This can be helpful to treat tumors because tumors grow at a rapid rate and they are "out of control". By inhibiting the mitosis production, the tumor cells can also stop growing.
Answer:
The heat they lose is proportional to the surface area of their bodies, while the heat they produce is proportional to their mass. This means that larger warm-blooded animals can generate more heat than they lose and they can keep their body temperatures stable more easily.
