Which description best defines the normal anatomic position?

The normal anatomic position is defined as a standardized way of observing and describing the body. In this position, a person stands upright with their arms at their sides and the palms facing forward. This position serves as a reference point for anatomical terminology and provides a clear, consistent way to describe the location of body parts and their relation to one another.

The choice involving standing with arms raised does not represent the standard anatomical position, as the arms must be at the sides for it to be considered 'normal.' Similarly, sitting with the legs crossed is not representative of the anatomic position, which specifies an upright stance. Lying on the side further deviates from the standard, as it does not involve the upright orientation necessary for the anatomic position. Therefore, the description of standing with arms down at the sides and palms facing forward is the most accurate depiction of the normal anatomic position.