This picture shows a skull with a cut made through the top of it. Imagining the skull upright, as it would be naturally, in which plane was this cut made? (Image Source: Bernard, Bill. Wikimedia: Creative Commons, Attribution-Share Alike 3.0 Unported, 2004.)

MCQs on the structure of the human body at the cellular, tissue, organ, and organ system levels. Topics include: the integumentary, skeletal, muscular, nervous, cardiovascular, lymphatic, respiratory, digestive, urinary, endocrine, and reproductive systems.