Every May, we take a moment to appreciate the mothers in our lives. One of the first miracles of motherhood begins even before the baby is born. Let’s think of everything that is programmed to happen as the baby takes her first breath.
The lungs of a fetus are at the ready, but benched for action during pregnancy. So, the puzzle is: how does a fetus get oxygen while bypassing its lungs?
First, let’s recap how adult circulation works and the role that lungs play.