![]() ![]() ![]() This is the vital lung capacity plus the residual volume and is the total amount of air the lungs can hold. No cheating! It is possible to suck/pump even more air into your lungs increasing the pressure above natural levels, then breathe out and pretend that your vital capacity is even bigger than it really is! This is probably not a safe thing to do and can damage the lungs. It can be up to ten times more than you would normally exhale at rest. So if you breathe in as much as you physically can and then measure the amount of air you can breathe out then this is known as the vital capacity. The most air you can exhale after taking the deepest breath you can. This air that is always in the lungs is called the residual volume. There is always some air remaining to prevent the lungs from collapsing. OK, let’s assume you have breathed out as far and as much as you can so you physically cannot breathe out any more. The amount of air left in the lungs following a maximal exhalation. So if you breathe out normally as you would, then try and breathe out even more until you physically cannot breathe out any more air, then this is the expiratory reserve volume. The amount of extra air exhaled (above tidal volume) during a forceful breathe-out. So if you breathe in the normal amount you would at rest, and then see how much additional air you can breathe in before you simply cannot breathe in anymore, then this extra amount is the inspiratory reserve volume. The amount of extra air inhaled (above tidal volume) during a deep breath. So if you are sitting normally and breathing quietly then the amount of air breathed in is the tidal volume. The amount of air that enters the lungs during normal inhalation at rest as opposed to exercising. ![]()
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