The right ventricle, located just below the right atrium, receives blood flow to be passed to the lungs. The right atrium and the right ventricle are connected by an orifice which is about an inch and a half in diameter. This opening is protected by the tricuspid or three-fold valve which allows blood to travel between the two chambers. From the right ventricle, the pulmonary artery is the pathway for deoxygenated blood to pass into the lungs. There is an opening between the pulmonary artery and the right ventricle which is protected by the pulmonary semilunar valve (three-fold valve). This valve also controls blood flow between these two areas. Blood that passes through the right ventricle into the lungs releases waste products such as carbon dioxide and is refreshed with oxygen.

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