What is the meaning of the suffix "-cardia"?

The suffix "-cardia" specifically refers to conditions related to the heart. In medical terminology, it is commonly used to describe various heart-related conditions, as seen in terms like "tachycardia," which refers to an increased heart rate, and "bradycardia," indicating a decreased heart rate. This suffix is derived from the Greek word "kardia," meaning heart. Understanding this helps in recognizing that any term ending with "-cardia" pertains to the heart, reaffirming choice A as the correct interpretation of the suffix. The other options relate to different body systems and conditions that do not connect to the heart.