Which prefix refers to the heart?

The prefix "Cardio-" is derived from the Greek word "kardia," which means heart. In medical terminology, it is commonly used to refer to anything related to the heart, such as in the terms "cardiology" (the study of the heart) and "cardiovascular" (pertaining to the heart and blood vessels). Understanding this prefix is essential for distinguishing terminology related to heart health and diseases.

Other prefixes listed pertain to different bodily systems or organs, with "Neuro-" relating to the nervous system, "Gastro-" referring to the stomach or digestive system, and "Hemo-" relating to blood. Each of these prefixes indicates a specific area of the body that is not connected to the heart. Hence, "Cardio-" is the appropriate choice in relation to the heart.