Thermoregulation it the name for the behavior
Cells use oxygen to produce energy through a process called cellular respiration.
Its due to the fact of the acid in the stomach sometimes when digesting food you can hear certain noises of different chemical interactions happening down below, because all that has to happen for the nosie to get to your ears is vibarte through the bones and the body itself to your ear receptors which your brain processes into noises making you think that you just heard your stomach talk or something xD.
Enjoy!=)
