1. Heartburn is a burning sensation behind the breastbone. Unlike the name says heartburn has absolutely nothing to do with the heart. It is problem caused by the digestive system. The main type of heartburn is called Angina. It is caused by temporary shortage of oxygen being carried in the blood to the heart muscle. Heartburn occurs when small amounts of acid rise up into the esophagus. Unlike the stomach the esophagus does not have an …showed first 75 words of 526 total…

…showed last 75 words of 526 total…why doesn't it eat our own stomach? Well, it sort of does. The inner walls of the stomach are lined with tons of cells. These cells are constantly sacrificing themselves in order to protect the thicker, more vulnerable walls. Each minute more than 500,00 cells are sacrificed from the stomach wall and it completely regenerates all the cells in less than three days. 5.<Tab/>The usual pH level of our saliva is 6.4.