Question

what is the most appropriate term you would use when referring to the aorta b which lies on or by the side of the vertebrae and is more internal, as compared to a the lung which is closer to the the body surface?
human torso model with arrow a pointing to lung and arrow b pointing to aorta (showing organs in the thoracic and abdominal cavities).
proximal
distal
superficial
deep
superior
inferior

Explanation:

In anatomical terms, "deep" refers to a structure being further from the body surface. The aorta is more internal (deeper) compared to the lung which is closer to the body surface. Proximal and distal relate to distance from a reference point like the origin of a limb or a structure's attachment point. Superficial is the opposite of deep and means closer to the body surface. Superior and inferior refer to above - below relationships.

Answer:

deep