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What does the root 'cardio-' signify in medical terminology?

Liver
Blood
Heart
Joint

The correct answer is: Heart

The root 'cardio-' signifies the heart in medical terminology. It originates from the Greek word 'kardia', which means heart. This prefix is commonly used in various medical terms related to the cardiovascular system, such as 'cardiology' (the study of the heart) and 'tachycardia' (an abnormally fast heart rate). Understanding root words like 'cardio-' is essential for interpreting medical vocabulary, as they often convey vital information about the conditions being described. The other roots mentioned—such as those relating to the liver, blood, and joints—address different body systems or organs, but none connect specifically to the heart as 'cardio-' does.