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Physiology The study of the internal structure and function of living organisms, particularly humans. ■ "Did you know that the average human has over 100,000 miles worth of blood vessels? No wonder we're always running low on ink for our veins!
cardiology The scientific study of the heart and its functions, including cardiac anatomy, physiology, pathology, and treatment. ■ "I had to drop out of my cardiology class because I couldn't stop laughing at the professor's jokes about heart failure."