 Okay everybody, Dr. O here, in this video we're going to talk about your lung volumes and capacity. So we'll go through each one of these and I'll add a couple more things as well. So we're going to start with what's called the tidal volume right there in the middle. The tidal volume is the amount of air you normally move in a normal quiet respiratory cycle. A breath in and a breath out. Tidal volume in both men and women is usually right around 500 milliliters, that's probably the most important number on here, which leads us to the next, which is called the respiratory minute volume. That's going to be the amount of air you move per breath, your tidal volume, times your respiratory rate, how many times you breathe in a minute, similar to like your cardiac output being the stroke volume, how much you move per beat times your heart rate. So that's called the respiratory minute volume. Next on here we have what are called your reserve volume. So just like the names imply, the inspiratory reserve volume is how much more you can inspire or inhale than you normally do. Your expiratory reserve volume is how much more you can normally expire or exhale than normal. The inspiratory reserve volume is usually going to be 1,900 to 3,300 milliliters. Usually the lower end numbers would be for a female or someone with a small thoracic cavity, the larger numbers would generally be the male numbers. So 1,900 to 3,300 milliliters for your inspiratory reserve volume. Next the green one there, your expiratory reserve volume, I just explain what it is, how much more can you exhale than normal. Think about it, you take a normal quiet breath like that, how much more can you inhale than that, that's your inspiratory reserve volume. How much more air could you blow out than that, that's going to be your expiratory reserve volume. As far as numbers it's usually going to be between 700 and 1,000 milliliters. There at the bottom on this left hand side we have the residual volume. This would be how much air is in your lungs after you've blown as much out of it as you can. So how much, it's the air you can't control even once you've blown as much air out of your lungs as possible. You still have this residual volume which as you can see there is between 11 and 1,200 milliliters. One you don't see on here would be, excuse me, the minimal volume would be a fraction of that, that's going to be 30 to 120 milliliters. Your minimal volume would be how much air you have in your lungs even if both of them were to collapse. So think about like an empty balloon, still has a little bit of air in it, that would be called the minimal volume, not that big of a deal. Let's see, then we move on, we have the inspiratory capacity versus your functional residual capacity. So as you can see here, your inspiratory capacity would be your title volume, your normal breath in plus that inspiratory reserve volume. That's going to be between 24 and 3800 milliliters. Your functional residual capacity would be how much more air do you have in your lungs after you've taken a normal quiet breath out. And that's going to be between 1800 and 2200 milliliters. And again, the big ones so far have been your title volume and your two reserve volumes, those are going to be the most important ones. The next really important one is the vital capacity. The vital capacity is how much lung you can control and you can use. So as you can see here, it would be your inspiratory reserve volume plus your title volume plus your expiratory reserve volume. Sucking as much air into your lungs as you can and then blowing all of it out. Like if you're blowing up a huge balloon, that's the lung tissue, the lung space and volume that you can control. So that's called the vital capacity and that's generally going to be between 31 and 4800 milliliters. Residual volume, we've already said that's the part of the lung tissue you can't control. Then your total lung capacity would be all of it. How much air can there actually be in your lungs? And normally this is between about 4,200 and 6,000 milliliters. So about 4 to 6 liters, but some people have much larger lungs. I've had patients that have total lung capacities of 8,000, maybe even 9,000 milliliters, but that's kind of unusual. So I'm not big on having you memorize a lot of numbers. The most important number here is the title volume. Much more rather you understand what these different terms mean and what part of the lung we're actually talking about than the numbers. But it's important to familiarize yourself with them. Okay, so those are your lung volumes and lung capacities. I hope this helps. Have a wonderful day. Be blessed.