Question

Pick out the correct statements regarding $O_2-Hb$ 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 $p{O}_2$
(d) Curve 'D' represents lower $pC{O}_2$
(e) Curve 'B' represents higher $pC{O}_2$.

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

Answer 1

The correct option is A a, b, c, d

Curve C represents the normal curve of O2−HbO2−Hb dissociation.

When the concentration of Carbon dioxide increases, the curve shifts to the right side. So the curve D represents O

2−HbO2−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".