Answer:
A disorder affecting the alveoli (tiny air sacs) of the lungs. The transfer of oxygen and carbon dioxide in the lungs takes place in the walls of the alveoli. In emphysema, the alveoli become abnormally inflated, damaging their walls and making it harder to breathe.
Step-by-step explanation:
em·phy·se·ma
/ˌemfəˈsēmə/
nounMEDICINE
1.
a condition in which the air sacs of the lungs are damaged and enlarged, causing breathlessness.
"smoking can lead to serious lung diseases such as emphysema"
2.
a condition in which air is abnormally present within the body tissues.