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Cardiology
The study of the structure, functions, and disorders of the heart and blood vessels, as well as the diagnosis and treatment of such disorders. Blood vessels are tubes in the body that carry blood. Since heart disorders lead to the death of many people every year, cardiology is a large part of the training for virtually all physicians (medical doctors). Although many family medical doctors are familiar with common disorders of the heart, there are medical doctors that specialize in cardiology known as cardiologists.

Cardiology comes from the Greek word "kardia" meaning "heart," and the Greek word "logos" meaning "the study of." Put the two words together and you have "study of the heart."