Biology
How do cells use oxygen to power life?
Quick fact
Your lungs contain hundreds of millions of tiny air sacs called alveoli where oxygen enters the blood.
Why this is interesting
Every few seconds your body performs a life-saving exchange of gases that keeps billions of cells alive.
Read the full explanation
Understanding How do cells use oxygen to power life?
The respiratory system moves air into the lungs, transfers oxygen into the bloodstream, and removes carbon dioxide.
A deeper explanation
Breathing connects the external environment with every cell inside the body. Oxygen is transported through the blood and used during cellular respiration to produce energy, while carbon dioxide produced by cells is removed. The respiratory system works closely with the heart and metabolism to maintain life.