Which of the following fact suggest that most of the oxygen is transported from the lungs to the tissues, combined with the haemoglobin rather than dissolved in the blood plasma?
concentration increases the oxygen affinity of haemoglobin
Text Solution
Verified by ExpertsA
• Plasma can dissolve only a tiny amount of 
.
• Haemoglobin (Hb) in red blood cells binds 
, which makes the oxygencarrying capacity of whole blood far higher than plasma alone.
• Because of this, the blood that leaves the lungs carries much more 
than the blood that enters, showing that most 
is being carried as 
(oxyhaemoglobin), not just dissolved in plasma.
• Increase in 
concentration decreases the oxygen affinity of haemoglobin. This is the Bohr effect, which facilitates 
release in tissues. Important physiologically, but it doesn't prove Hb carries most of the 
compared to plasma.
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