Final answer:
The major classifications of emphysema include Centriacinar, Panacinar, and Paraseptal. Apex is not a classification of emphysema, but refers to the topmost part of an organ, like the lung.
Step-by-step explanation:
The major classifications of emphysema are Centriacinar, Panacinar, and Paraseptal. Apex is not a classification of emphysema; instead, it refers to the topmost part of an organ or structure, such as the apex of the lung. Emphysema is a type of chronic obstructive pulmonary disease (COPD) characterized by the destruction of the air sacs in the lungs.