External respiration is the process of exchanging oxygen and carbon dioxide between our lungs and the atmosphere. It's like a little trade: we take in oxygen and release carbon dioxide. Think of it like a refreshing drink of air - our lungs are like the "straws" that help us sip in the oxygen and blow out the carbon dioxide.
When we inhale, our diaphragm contracts and our lungs expand, allowing oxygen to flow in. Then, when we exhale, our diaphragm relaxes and our lungs deflate, pushing out the carbon dioxide. It's a pretty simple, yet essential process that happens automatically, without us even thinking about it.
