Patient Care Technician Certification (PCTC) AMCA Practice Exam

What prefix means outside?

1. Inter

2. Intra

3. Exo

4. Sub

The correct answer is: Exo

The prefix that means "outside" is exo. This prefix is derived from the Greek word "exo," which translates directly to "outside" or "outer." It is commonly used in medical terminology to describe concepts related to external structures or conditions, such as exoskeleton (an external skeleton) and exogenous (originating from outside the body). In contrast, the other prefixes have distinct meanings that do not represent the concept of being outside. For instance, "inter" is used to signify "between" or "among," often appearing in terms that describe relationships or positions relative to one another. "Intra" indicates "within" or "inside," making it the opposite of exo, as it pertains to structures or conditions that exist internally. Lastly, "sub" means "under" or "below," indicating a position underneath something else rather than being externally located. Understanding these distinctions in prefixes is essential for grasping medical terminology and accurately interpreting related concepts in patient care.