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What is the partial pressure of CO2 in the lungs at one atmosphere?
Wiki User
∙ 12y ago
Is this a trick question? One atmosphere gives normal (earth) pressure so the partial pressure would be directly equivelant to the percentage of CO2 in the air you're breathing at that time. Hopefully nil, but if you have a rebreather there will be some or if you are in a small room where you or others have already been breathing there will be some. There will be some in normal air but it should be negligible.
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The PP of CO2 at one atmosphere (at 15C at a pressure of 101325Pa) is 0.0314% of the total pressure, i.e. 14.7PSI in. or roughly 0.004616lbs/sq in. This assumes the diver is (a) on the surface (and doesn't mean 1atm above surface pressure or 29.4PSI or 33ft of sea water) and that his lungs are pressurized to exactly 1 ATM (which may be slightly off if he is holding his breath). This percentage may actually be less with a properly charged and tuned rebreather in that the CO2 scrubbing in the rebreather is intended not to remove all the CO2, but instead to reduce it to the same PP as one would find in a surface air mixture. This is as opposed to an open breathing system which, assuming an air fill and not mixed gasses, will have the same PP-CO2 as surface air and thus needs no adjustment.
This is important because the initial/normal breathing reflex is triggered by serum PP-CO2 (and not as is commonly thought, P-O2). A secondary breathing reflex pattern -- Cheyne-Stoakes respiration triggers off P-O2m but is not normal breathing and is diagnostic of severe CNS insult (i.e. if you're breathing this way you likely aren't conscious and are likely near death). Depleting all CO2 from the breathing source can result in depleted serum CO-2 which in turn fails to trigger the normal breathing reflex, and may result in hypoxia and syncope, resulant in death.
Cjonb 21:30, 2 Jun 2008 (UTC)
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The partial pressure of CO2 in the inhaled air is irrelevant. The CO2 in the lungs does not come from the inhaled air, it comes from the blood, which creates around 40 mm Hg of CO2 in the lungs, about 100 times as much as is present in the atmosphere. This is a physiological norm, essential for maintaining correct pH of the blood, with deviations to either lower or upper side being equally dangerous.
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∙ 12y ago
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∙ 12y agoyes, green
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How do the structures of alveoli and capillaries support the function of gas exchange?
Exchange of gases in alveoli takes place through diffusion. This diffusion takes place to partial pressure differences among the gases O2 and CO2. The partial pressure of O2in alveolar sac = 103 mm Hg The partial pressure of O2 in blood = 50mm Hg The partial pressure of CO2 in alveolar sac = 28 mm Hg The partial pressure of CO2 in blood = 45 mm Hg As a result, the O2 from alveolar sacs diffuses into blood. the CO2 diffuses from blood into lungs.
NO2 CO2 SO2 is in a bottle the partial pressure of NO2 is 1.25 atm and the partial pressure of CO2 is 2.63 atm if the total pressure of the gases is 11.20 atm what's the partial pressure of SO4?
The partial pressure of SO4 in a bottle of NO2, CO2, and SO2, is 7.32 atm.
Does oxygen and other gases enters the nose and travel down to the windpipe but only the oxygen enters the lungs?
They all enter the lung ... but the only one that quickly enters the blood is oxygen. Because oxygen is the one gas that has a higher partial pressure in "lung air" than its partial pressure in the "lung blood". Note that the blood's CO2 pressure is higher than the air in the lungs, so CO2 comes out of the blood into the lung's air.
What is the difference between pco2 and paco2?
pco2 is partial pressure of o2 in the capillary and paco2 is partial pressure of co2 in the arteries. So, one is a measurement of O2 and the other is CO2
What is the partial pressure of oxygen in blood gas a mixture of N2 O2 and CO2 if the partial pr. of Nitrogen 630 mm of Hg and partial pressure of CO2 is 39 mm of Hg?
If the total (=atmospheric) gas pressure is 760 mm Hg, then the remaining partial pressure of 760 - (630 + 39) = 91 mm of Hg is for the 3rd gas in blood: Oxygen (O2)
What is the partial pressure of oxygen in a balloon?
The partial pressure of oxygen will vary according to where you look. Atmospheric oxygen partial pressure is approximately 21% of the atmospheric pressure of the location at which you measure (typically around 1 atmosphere at sea level, making the partial pressure of oxygen at seal level 0.21 ATM or 21.3KPa). The value varies geographically and with time, but also varies in different tissues of organisms, since not all oxygen available is absorbed, and complex multicellular organisms will have certain tissues (respiring muscle) that use up oxygen, resulting in a lower partial pressure there.normal oxygen partial185.4 kPa or in another unit:100 mmHg in the arterial blood. The partial pressure on the alveolar site is about 105 mmHg.
Where does gas exchange occur in the lungs?
gaseous exchange in the lungs takes place in the walls of the alveoli which are provided with a rich supply of blood vessels .the partial pressures of the gases .i.e. CO2 and oxygen in the atmosphere and the blood vessel is naturally perfect for the diffusion of gases.
What is the partial pressure of CO2 in bar in atmosphere if its concentration is 385 parts per million by volume and the total atmospheric pressure is 14 pis?
Assuming ideal gas behaviour for CO2 and air, the mole fraction of CO2 in air wouldbe 0.000385 since the data of 385 ppm are given by volume.Then the partial pressure of CO2 in the atmospheric air is given by the product ofCO2 mole fraction and the atmosphere's total pressure.So, p.p.CO2 = 0.000385 x 14 psi = 0.00539 psi.Relation of psi to bar, 14.696 psi = 1.01325 bar.Finally, p.p.CO2 = 0.00539 psi x [1.01325 bar/14.696 bar] = 3.72 x 10-4 bar
This gas is carried back to the heart and then to the lungs where it is released back into the atmosphere?
CO2 - Carbon dioxide.
What is the partial pressure of CO2 in the arterial and venous blood?
The normal partial pressure of oxygen in arterial blood is 75-100 millimeters of mercury. In comparison the partial pressure of oxygen at sea level is 750 millimeters of mercury.
How refreshing the air in the air sacs helps to maintain a steep diffusion gradient?
It increases the partial pressure of oxygen, so the concentration is higher than that of the blood. Therefore the partial pressure of CO2 decreases , so Co2's concentration is lower than the bloods.
What is PaCO2?
The concentration of Carbon Dioxide in arterial blood. Partial (Pa) Carbon Dioxide (CO2) pressure in ABG.
