BIOCHEMISTRY
9th Edition
ISBN: 2818440090622
Author: BERG
Publisher: MAC HIGHER
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Chapter 7, Problem 9P
Interpretation Introduction
Interpretation:
The effect of the increased concentration of
Concept introduction:
The protein which contains oxygen and is present in the red blood cells in the body is known as hemoglobin. It contains iron as well.
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Comparison of Fetal and Maternal Hemoglobins.Studies of oxygen transport in pregnant mammals show that the O2-saturation curves of fetal and maternal blood are markedly different when measured under the same conditions. Fetal erythrocytes contain a structural variant of hemoglobin, HbF, consisting oftwo a and two g subunits (α2γ2), whereas maternal erythrocytes contain HbA (α2β2).
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b)What is the physiological significance of the different O2 affinities?
c)When all the BPG is carefully removed from samples of HbA and HbF, the measured O2-saturation curves (and consequently the O2affinities) are displaced to the left. However, HbA now has a greater affinity for oxygen than does HbF. When BPG is reintroduced, the O2-saturation curves return to normal, as shown in the graph. What is the effect of BPG on the O2affinity of hemoglobin? How can the above information be used…
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