Prefixes are added before root words to create new words. Common medical prefixes usually indicate a body part, such as "cardio-" meaning heart or "gastro-" meaning stomach. Examples are provided of medical terms formed by combining prefixes and roots, such as "cardiomegaly" meaning an enlarged heart or "gastrology" relating to the study of the stomach. A table then tests knowledge of matching prefixes to their meanings for body parts including the stomach, heart, kidney, bone, and joint.