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.
The total surface area of the lungs is about 25 times that of the body's skin surface. The lungs secrete a detergent substance. This detergent reduces the surface tension of the fluid lining, allowing air in. All the cells of the body need oxygen to survive. Oxygen is present in the air we breathe, and it is the job of the lungs to take oxygen from the air and transfer it to the blood where it is carried to the cells.