there is always air left in the lungs because it needs the oxygen foe the lungs to inflate and deflate
Residual volume is the air that remains in the lungs after a maximal exhalation. It is considered a type of "stale" or stagnant air that cannot be voluntarily expelled and helps keep the lungs inflated.
Residual volume of air is the volume of air remaining in the lungs after maximal exhalation. It is not possible to voluntarily exhale this air, as it helps to keep the lungs inflated and prevents them from collapsing. Residual volume plays a key role in maintaining the oxygen-carbon dioxide exchange in the lungs.
The air left in your lungs after exhaling is called "Expiratory Reserve".
it is left so that there is sufficient time for enough oxygen to be absorbed and for the carbon dioxide to be released
In short no. When breathing normally the flow of air in and out is called the tidal volume and is usually about 500ml per breath (the fluction of lung volume is 2300ml to 2800ml in a breath). The most air you can possibly breath in is called the Inspiratory Reserve Capacity and can take the total lung volume up to about 5800ml (increasing the inspiration from tidal by 2000ml). The most air you can force our of you lungs is called the Expirational Reserve Volume and can bring the lung volume down as low as 1200ml. The 1200ml left is called the residual volume and is always in the lungs no matter what because if it left the lungs all the Alveoli (air sacs) would collapse and be unable to function again. Combinations of these different values give different important number that but these are not really relevent to the question. *all vallues are taken from statistical results and are not relevant to everyone.
What happens is the vital capacity of the lungs greatly increases over time while residual volume decreases. Essentially the body is becoming more conditioned and the entire cardiovascular system improves, therefore it does not need the extra residual volume. However, if someone were to not exercise at all the opposite would occur. Source: Fitness For Life class I was in during winter quarter of 2011.
Residual means the fibrosis was left behind as permanent scarring of the lungs, after whatever disease was gone. You get residual scarring or fibrosis after some lung infections. Fibrosis means it looks like fine threads or fibers on the x-ray. Residual anything is a leftover.
Lakes which are made by residual rocks which are left after weathering and erosion and form the residual lakes.
residual, remaining, outstanding, left over, lingering, enduring, lasting, left behind
The volume of air which you normally breathe in and out is called the tidal volume. This is normally about 500 cm3 when you are at rest. However if you breathe in as much as you can you can breathe in more than 500 cm3. The extra volume of air breathed in (inspiration) is called the inspiratory reserve volume.Similarly when you breathe out as much as you can, the extra volume of air breathed out (expiration) is called the expiratory reserve volume. These three volumes added together give you your vital capacity: the maximum volume of air you can breathe in or out. When you have breathed out as much as you can there is still some air left in your lungs ie you cannot empty your lungs completely. This volume is called the residual volume.The vital capacity plus the residual volume equals your total lung capacity. See http://en.wikipedia.org/wiki/Lung_volumes http://www.healthsystem.virginia.edu/internet/anesthesiology-elective/airway/lungvolumes.cfm
No. A spirometer can be used to measure the volume of breath a person can expire but it is impossible to expire your entire lung capacity. This is due to the "dead space" capacity that remains to stop the collapse of the alveoli. As the alveoli are spherical and lined with mucus if they collapse it would be impossble for them to be filled again and so some air must remain within them. It is, however, possible to estimate someone's total lung capacity from the spirometer reading.
You will always heard that humans have only two lungs . NOT RIGHT ! Humans actually have 5 lungs together . 3 in the right side and 2 in the left side . Why two in the left side ? Because of the heart occupying a lot of space there is not enough space for the other lung .