What is the partial pressure of oxygen contained by blood? & what maintain this pressure?
Answers:
Oxygen Transport
In the lungs, oxygen diffuses from alveolar air into the blood because the venous blood have a lower partial pressure. The oxygen dissolves in the blood. Only a small amount is carried as a physical solution (0.31 ml per 100 ml). The remainder of the oxygen is carried contained by chemical combination with the hemoglobin within red blood cells (erthrocytes).
from http://www.elmhurst.edu/~chm/vchembook/2.
Normal analysis results
Normal blood gas values are as follows:
partial pressure of oxygen (PaO2): 75-100 mm Hg
from http://www.healthatoz.com/healthatoz/ato.
Oxygen surrounded by blood is not under pressure, it is piece of the blood.
Arterial and venous blood have different partial pressure values the former self higher rthan the latter as trhe latter is the result of OXgen one drawn by tissues for consumption. The atmosphereic pressure anbd the Percentage of O2 in the atmosphere, The Respiratory rate, tidal volume, the Surface nouns of the lung (Almost the size of a football field if you really spread it out) and the bloof flow rate adjectives determine the Partial pressure of O2 in Arteries and vein.
Arterial PaO2 is usually higer than 75 mm Hgand under regular atmospheric conditions in a sound adult who is physiologically at res can be in motion as high as 110 though it can be made to complete higher values below laboratory atmosphereic conditions - higher atmosphereic pressure and high o2 percentage in the environment or Physiological alterations such as hyperventialtion. Venous Partial pressure is ususlaly around 60 mm Hg and this depemnds on the amount of oxygen human being drawn by the tissues and blood flow rate - sluggish flow means more o2 will be drawn and lower Po2. cell Respiratoiiry poisons - eg :- cyanide will result contained by higher venous P02 as Oxygen cannot be utilised by tisues and accordingly it is not drawn from the vacular compartment.
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