Our lungs provide oxygen to our blood cells, and eliminate the carbon dioxide that our bodies produce.
The two lungs together weight about 3 pounds. The left lung is smaller than the right lung.
The lungs have 300 to 500 million alveoli, which are the tiny air sacs where carbon dioxide and oxygen are exchanged.
The average person can hold their breath for 30-60 seconds. Free divers, who swim without snorkel or scuba gear, can hold their breath for up to 10 minutes!
The lungs produce mucous, and have tiny hairs called cilia, that clear out bacteria or pollution that may enter them.
The average person breathes in 45 pounds of dust over their lifetime.
A cough travels at 60 miles per hour!