Certified Tumor Registrar (CTR) Practice Exam

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The prefix "endo" in the word endocardium means?

Outside
Between
Within
Over

The correct answer is: Within

The prefix "endo" comes from the Greek word "endon," which means "within" or "inside." In the context of the term "endocardium," this prefix refers to the inner layer of the heart, which lines the heart chambers and valves. Understanding the meaning of "endo" helps clarify that it indicates a location that is internal rather than external, linking it specifically to structures that are situated inside another organ or cavity. Thus, "endocardium" pertains to the innermost lining of the heart, which accurately aligns with the definition of "within."