Respiratory System
This picture of a human respiratory system can be also used as a picture of an American Black Bear respiratory system. It works through when the black bear breathes oxygen and carbon dioxide in through their nose and mouth and it makes its way to the lungs where gas exchange occurs in the Alveoli, which are lined with capillaries.
Here is in fact a picture of a wolf, oddly enough this body structure is extremely similar to a humans and American Black Bears. You can see the different components clearly in this diagram. The trachea and the lungs are clearly labeled in the diagram where they would be for both an American Black Bear and a human.