Did You Know!
Your Lungs Have the Surface Area of a Tennis Court
Inside your lungs are about 300–500 million alveoli. When fully expanded, the total surface area available for oxygen exchange is roughly 700–1,000 square feet — about the size of a tennis court.
This enormous surface area allows:
- Oxygen to rapidly enter the bloodstream
- Carbon dioxide to efficiently leave the body
Most people imagine lungs as just two balloon-like sacs — but internally, they’re more like a vast, folded oxygen-processing network.
