NO supplies blood to organs when they call for it. When they need this blood supply, whether it is for movement or warmth, our brain tells the blood vessels to release Nitric Oxide. When we eat, NO is sent to our stomach to digest food. When it is there, it can control our blood pressure, and give our body more blood flow or less blood flow depending on our activity level. It also is released into the heart to dilate blood vessels and relieve chest pain.