Guts and Bolts game players should understand that the human body’s interconnected organ systems are much more complicated than that of Moby’s Robot. When labeling the heart, students should understand that when referring to the right and left of the body, it is in reference to the right and left of the subject, not the right and left of the observer. When observing a body (in this case, heart) in the anatomical position, the left of the body is on the observer’s right, and vice versa. Students sometimes believe that exhaled carbon dioxide is an unused gas that was inhaled, not created as a byproduct of cellular respiration.