yes lungs do take in air. They take in 100% and release 80% and 20% stays in you>
To transport in the blood to your cells to combine with glucose (sugar) to make energy so you can function. And when you exercise you need more energy so you breathe faster to get more air to get...
Oxygen.
Actually, neither lung takes in more air than the other. They both take in the same amount of air at the exact same moment..