Human need oxygen to survive. Each time you take a breath, air rushes into your lungs and oxygen passes from the air into your blood. To get enough oxygen into your body your lungs need a very large surface area in contact with the air. If your lungs could be unpacked and laid out flat, they could wrap up your body at least 25 times.
What do lungs look like?
Lungs are like air-filled sponges. Air flows into the lungs through a tube called the windpipe. This tube divides into many smaller tubes called bronchi, and these subdivide again into even smaller tubes called bronchioles. Each bronchiole ends in a cluster of tiny air pockets called alveoli, which are buried deep inside the lungs. You can also find the diagram of lungs at www.mydr.com.au
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