Consider what you know about pedigrees. how could doctors use pedigrees to prevent and treat disease? how could knowing about your genetic history and potential for disease affect your family, social, and work life?

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.