Modern technology allows for non-surgical means that doctors can use to inspect the various parts of a person's heart, measure its dimensions, and identify any abnormalities such as of heart valve narrowing or leakage.
Color images show how the blood moves and flows through the heart.
This web site has information about all kinds of medical careers. Volunteer at your local hospital or clinic. Learn CPR and take first aid classes from the American Red Cross. If there's no local chapter near you, call or write the national headquarters for more information. The Heart Owner's Handbook By Texas Heart Institute,Denton A. Cooley.