Introduction to Dietetics Nutrition (NHM 195) Practice Test

Endo- indicates within, inside, or internal, pointing to something located toward the interior of a structure. This is why it appears in terms like endocardium (the inner lining of the heart), endoscope (a instrument used to view inside the body), and endometrium (the inner lining of the uterus). Because endo- conveys an inside/inner position, the best choice is inner. The other options describe outside or outer positions (outer, external) or a middle position (mid), which do not match the sense of endo-.