Why the PH of deoxygenated blood is lower than oxygenated blood
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pH of deoxygenated blood is lower than oxygenated blood because major part of the carbon dioxide in the deoxygenated blood is present in the form of carbonic acid which lowers its pH.
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The reason behind it is, in our venous blood carbon dioxide is dissolved. The dissolved carbon dioxide produces the carbonic acid. This carbonic acid makes the venous blood a little bit more acidic than the blood of our artery, because our artery carries oxygen in it. Presence of free hydrogen ions increase acidity, lowers pH of venous blood .
Venous blood gas samples are often more simple to obtain than arterial blood gas samples. The PCO2 of venous blood is usually 4 to 6 mm Hg higher and the pH is usually 0.02 to 0.05 units lower than those of arterial blood.
Venous blood gas samples are often more simple to obtain than arterial blood gas samples. The PCO2 of venous blood is usually 4 to 6 mm Hg higher and the pH is usually 0.02 to 0.05 units lower than those of arterial blood.
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