So the increasing portion of our blue curve is the process of inhalation and the decreasing portion of the blue curve is the process of exhalation. So let's begin by describing something called the title volume. So earlier we asked how much air, on average is exchanged by our lungs when the individual is actually at rest every single time we take a breath. So if I stand here and I don't exercise, then I basically take about ten breaths of air every single minute. And every one of these breaths exchanges about 500 air inside our lungs. And this is what we call the tidal volume.