Homestead is a city within Miami-Dade County in the U.S. state of Florida, nestled between Biscayne National Park to the east and Everglades National Park to the west. Homestead is primarily a Miami suburb and a major agricultural area. Homestead was incorporated in 1913 and is the second oldest city in Miami-Dade County next to the city of Miami. It is located approximately 35 miles (56 km) southwest of Miami, and 25 miles (40 km) northwest of Key Largo.
Airways Inside the Lungs. Airways Inside the Lungs. The lungs' airways (bronchial tubes) divide into smaller and smaller branches (bronchioles). The airways end in air sacs (alveoli) where oxygen moves into the blood.
Emphysema is a disease of the lungs. It occurs most often in smokers, but it also occurs in people who regularly breathe in irritants. Emphysema destroys alveoli, which are air sacs in the lungs. The air sacs weaken and eventually break, which reduces the surface area of the lungs and the amount of oxygen that can reach the bloodstream. This makes it harder to breathe, especially when exercising. Emphysema also causes lungs to lose their elasticity.