what heart chamber determines arterial blood pressure
To understand PH, it helps to understand how your heart and lungs work. Your heart has two sides, separated by an inner wall called the septum. Each side of your heart has an upper and lower chamber. The lower right chamber of your heart, the right ventricle (VEN-trih-kul), pumps blood to your pulmonary arteries. The blood then travels to your lungs, where it picks up oxygen. The upper left chamber of your heart, the left atrium (AY-tree-um), receives the oxygen-rich blood from your lungs.