Patient Paperwork - Where to Find CPT Codes. 1  As we leave a doctor's appointment, check out of the hospital, or any other medical facility, we are handed paperwork that, to the professionals, is a numeric summary of the services they provided to us. The five character codes are usually CPT codes.
Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body. From the tissue capillaries, the deoxygenated blood returns through a system of veins to the right atrium of the heart.
Note that these are the only veins in the body that contain oxygenated blood; all other veins contain deoxygenated blood. The pulmonary veins enter the left atrium. When the left atrium relaxes, the oxygenated blood drains into the left ventricle through the left AV valve.