Put these parts of the heart in chrono order of blood flow beginning with blood entering through superior and inferior vena cava... Superior vena cava, Inferior vena cava, right pulmonary veins, right atrium, pulmonary valve, right ventricle, aortic arch, left pulmonary artery, pulmonary trunk, left atrium, circumflex artery, left ventricle.
The first available PPI agent, omeprazole (Prilosec), has been available over the counter without a prescription for the past few years. When omeprazole was first approved, it carried a warning to use for only eight weeks because of concern at the time about an increased risk of stomach cancer.
1 If you are taking Prilosec to treat gastric or peptic ulcers (sores in the lining of your stomach), your symptoms should improve within eight weeks.  If you are taking Prilosec to treat a duodenal ulcer (a sore in the first part of your small intestine or duodenum), your symptoms will likely improve within four weeks.