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Oxygen dissociation curve of haemoglobin is[1994]
- a)Sigmoid
- b)Hyperbolic
- c)Linear
- d)Hypobolic
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Oxygen dissociation curve of haemoglobin is[1994]a)Sigmoidb)Hyperbolic...
It is the relationship between the percentage saturation of haemoglobin (by volume) in the blood and the oxygen tension (in partial tension) PO2 of the blood.
It is usually a sigmoid plot. Haemoglobin molecules can bind up to four oxygen molecules in a reversible way. The shape of the curve results from the interaction of bound oxygen molecules with incoming molecules. The binding of the first molecule is difficult. However, this facilitates the binding of the second and third molecules, and it is only when the fourth molecule is to be bound that the difficulty increases, partly as a result of crowding of the haemoglobin molecule, partly as a natural tendency of oxygen to dissociate.
It is usually a sigmoid plot. Haemoglobin molecules can bind up to four oxygen molecules in a reversible way. The shape of the curve results from the interaction of bound oxygen molecules with incoming molecules. The binding of the first molecule is difficult. However, this facilitates the binding of the second and third molecules, and it is only when the fourth molecule is to be bound that the difficulty increases, partly as a result of crowding of the haemoglobin molecule, partly as a natural tendency of oxygen to dissociate.
The O2-Hb dissociation curve is a sigmoidal curve that represents the relationship between O2 concentration and the percentage saturation of Hb. As the concentration increases from about 90% there is a significant plateau in the curve, which has several important biological repercussions.
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Oxygen dissociation curve of haemoglobin is[1994]a)Sigmoidb)Hyperbolicc)Lineard)HypobolicCorrect answer is option 'A'. Can you explain this answer?
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