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Normal atmospheric pressure of air is 150 mm Hg for oxygen (around 610 mm Hg for nitrogen). This equals 760 mm Hg in the atmosphere. In the alveoli, however, pressure is lower because 30% is being used by tissues, leaving 70% of 150 mm Hg oxygen in the alveoli. That means around 100-105 mm Hg is the partial pressure of oxygen in alveoli.
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∙ 16y ago
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∙ 15y agoPartial pressure of any gas is a measurement, in essence, of how much gas there is in any environment. By environment, I mean that you could be talking about how much gas is dissolved in a liquid or how much gas is present in a room, or how much is contained in a jar. In a way, it can be loosely interpreted as describing the concentration of a gas in a particular environment. For example, if I tell you that the partial pressure of oxygen in our environment is approximately 160 mmHg, you could tell me that the percentage of oxygen in the air we breathe is 21%. That is because, at sea level, the overall pressure of air is 760 mmHg. 160 / 760 = 0.21 = 21%. With regards to your question about the partial pressure of oxygen in arterial blood, the answer is that it depends on many things. It depends on the patient's age, state of health, metabolic rate, the concentration of oxygen that they are inhaling, etc. Having said that, a "normal" value for a young, healthy person breathing room air (21% oxygen) is PaO2 = 100 mmHg.
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∙ 14y agoNormal pO2 in arterial blood is 95-100 mm Hg.
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∙ 15y agoThe partial pressure of CO2 is 45 mm Hg in the aterial blood, but is reduced to 40 mm Hg in the alvolar air.
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∙ 12y ago109mmhg
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Is the pO2 of blood in the pulmonary arteries is greater in the alveoli?
No, firstly pO2 is not a particularly good term for the measurement of oxygen within the blood as most of it is tied up in the heamoglobin molecules and as such is not part od the pO2. Secondly the pulmonary artery is the artery that carried deoxygenated blood from the heart to the lungs where they gain oxygen from the alveolar cavity. Under the laws of diffusion this means the pO2 in the alveoli must be higher than the "pO2" in the blood here, but even just common sense tells you that the oxygen levels in the blood here are very low as this is the whole point in the blood going to the lung.
What is the type of transport that oxygen move from the alveoli into the pulmonary capillary blood?
Oxygen diffuses from the alveoli into the blood due to higher PO2 (partial pressure of oxygen) levels in the alveoli than in the blood.
Exchange of gases in the lungs?
blood entering the lungs has a partial pressure of oxygen (PO2) of 40 mmHg and a partial pressure of carbon dioxide (PCO2) of 46 mmHg; alveoli, on the other hand, have a PO2 of 105 mmHg and a PCO2 of 40 mmHg. As the blood moves past the alveoli, oxygen and carbon dioxide will diffuse down their respective partial pressure gradients. Oxygen will move from the alveolar space (PO2 of 105 mmHg) to the blood stream (PO2 of 40 mmHg). Carbon dioxide will move from the blood (PCO2 of 46 mmHg) to the alveolar space (PCO2 of 40 mmHg). As the blood leaves the alveolus, the PO2 and PCO2 will have essentially equilibrated with the alveolar air.
Why does the arterial Po2 decrease with emphysema?
emphysema is a condition of loss of elasticity of the alveoli where exchange of oxygen and Co2 occurs. The alveoli cannot efficiently exchange oxygen for Co2 so Co2 builds up in the blood. It is usually caused by chronic smoking but can be caused by other diseases/conditions.
What would be the pH of a solution when H3PO4 equals H2PO4?
Assuming the Ka= [H+][PO2-]/[PO3-] and that PO3=PO2- then we can safely assume Ka= [H+][PO2-]/[PO2-] and so Ka= [H+][PO2-]/[PO2-] Ka=[H+] since the Ka of Phosphoric acid is equal to 7.5x10-3 then we can take -log(7.5x10-3) to find the pH=2.12
Which blood vessel has a Po2 of 104 mm Hg?
Rather than a blood vessel with a value of 104mm Hg for Po2, it is alveolar gas thatt has a Po2 of 104 mm Hg
What is PO2 in blood?
PO2 in blood is the amount of gases in your blood. In medical terms, this is commonly called the Alveolar-arterial.
What is the name for PO2?
PO2(OH)2 is the same as H2PO4^- (note the negative charge). It would be dihydrogen phosphate.
How do you find the dissolved O2 content give plasma PO2 and Hb content?
PO2 can be estimate of dissolve O2,PO2 keep the oxygen on hemoglobin so if there is increase affinity of oxygen then required PO2 willbe low.each HB carry 20vol% O2 per 100ml of blood in a 100% saturation.if the dissolve oxygen become less then PO2 also become less in order to deliver more dissolve form to tissues.actua;;u ddissolve O2 at 100mmhg of PO2 is 0.3vol%/100ml of blood
The relative PO2 and PCO2 in pulmonary arteries and veins and systemic arteries and veins?
Pulmonary artery/Systemic veins PCO2 = 45 PO2 = 40 Pulmonary vein/Systemic arteries PCO2 = 40 PO2 = 100
What is Po2 gas?
PO2 IS THE OYGEN BLOOD LEVEL IN YOUR BODY (More specifically, pO2 is the partial pressure of oxygen in different parts of your body. For example, the partial pressure of oxygen (pO2) is higher in your lungs than it is in various tissues like muscles. Therefore, oxygen is absorbed in the lungs and dispersed through your muscles.)
What connects the respiratory and circulatory system?
Alveoli
