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Question

Pick out the correct statements regarding O2Hb dissociation curve.
(a) Curve 'C' may be normal curve
(b) Curve 'A' may be for myoglobin
(c) Curve 'B' represents saturation of Hb at low pO2
(d) Curve 'D' represents lower pCO2
(e) Curve 'B' represents higher pCO2.

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A
a, b, c, d
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B
a, b, c
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C
a, b, d
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D
All are correct
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Solution

The correct option is A a, b, c, d
Curve C represents the normal curve of O2HbO2−Hb dissociation.
When the concentration of Carbon dioxide increases, the curve shifts to the right side. So the curve D represents O
2HbO2−Hb dissociation curve in higher carbon dioxide concentration.
Since myoglobin has a higher affinity to the oxygen, the curve drastically shifts to left like in Curve A.
So the statements a,b and D are correct.
So the correct answer should be option C "a, b, d".

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