What does heart do in digestive system?

Exercising for at least 10-12 minutes at a time to get oxygen to the muscle cells? What could a small hard smooth round bump inside the nose that feels like its on top of the bone under the nose and is getting bigger but doesn't hurt and is only sometimes vaguely itchy be? What are the imports and exports of the muscular system? What is the phobia of discos? Do I have aspbergers? How do doctors define bad cholesterol? If you were 6 weeks pregnant when was the conception date? What kind of tools are made of mammoth bones? Does increased barometric pressure cause headaches? Does both chemical and mechanical digestion break down food into smaller units? What is the open sore that discharge is a fluid and does not heal normally? What is the spinal cord portected by? What is the prevalence of paruresis? What is it called when you get a rash from a mattress? What is the name of the mosquito that spreads Swine Flu? Is BLS and CPR are the same training? What is the meaning of stets as related to the heart? I am getting these stinging feelings in the left part of my chest. happens few times a day and makes it hurt to breathe. But after 5 seconds it goes away Any suggestions on what this might be? What is the purpose of the lead foil in dental film? What are the symptoms of mononucleosis?