It’s Breathe Week – a whole week of episodes about one of the most important things our bodies do to keep us alive and healthy. When you take a big breath, your lungs fill up with oxygen. But why is oxygen so important? We asked pediatrician Stephanie Lovinsky-Desir to help us find the answer.

Got a question that’s a real breath of fresh air? Send it to us at BrainsOn.org/contact, because we periodically choose questions to answer!