Facts at a Glance Lungs are about the size of a pair of footballs and fill the chest from neck to ribs.
Lungs have sections or lobes.
The right lung is larger with 3 sections. The left lung has two sections. Each person has about 600 million alveoli. In a lifetime, the average person will breathe about 75 million gallons of air. Lungs are the only organ in the body light enough to float on water.