The center solid curve represents the oxygen dissociation of hemoglobin, pH, Oxyhaemoglobin (% Saturation) concentration, and an increase in concentration of 2,3 bisphosphoglycerate. 100 90 80 70 60 50 40 30 20 10 10 20 represents the curve at a decreased CO2 represents this curve at a reduced A. 10. 30 40 50 represents the curve with 60 70 80 90 100
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- Below is the oxygen saturation curve for myoglobin and hemoglobin at a pH of 7. The p50 for myoglobin is indicated by the dashed lines on the graph. Mb and Hb O2 saturation: pH 7 10 0.8 Myoglobin 0.6 P50 = 0.2 0.4 Hemoglobin 0.2 - 0.0 pO2 [kPa] Which of these molecules (Mb/Hb/neither or both) has cooperativity? [ Select ] What would you expect to happen to the p50 of myoglobin if the pH were decreased to a pH of 4? [ Select ] Fraction saturationIf normal plasma pH is 7.4 and normal [CO2) is 1.2 mM, what is the normal (HCO321? The pK9 for this system is 6.1. Phosphoric acid (H3PO4) has three dissociable protons, with the pK,'s shown below. Which form of phosphoric acid predominates in a solution at pH 4? Explain your answer. Acid H3POA 2.14 H2PO4 6.86 HPO,2- 12.4Below are multiple oxygen binding affinity curves for hemoglobin. The affinity curve for normal hemoglobin in blood is represented by curve "D," at a pH of 7.2 and at a concentration of 5mM BPG and 26 mM CO2. O₂ saturation (%) 100 Answer 1: B Answer 2: [Select] Answer 3: B Answer 4: 80 A 60 1. How would changes to acidity, BPG concentration and CO₂ levels affect the binding affinity curve and p50? lower than Answer 5: E 40 1. BPG concentration is decreased to 3mM: The binding affinity curve would look like B. The p50 would be lower than normal (D). 2. pH is increased to 7.6: The binding affinity curve would look like B. The p50 would be [Select] normal (D). 20 3. CO₂ concentration is increased to 30 mM: The binding affinity curve would look like. [Select] The p50 would be Answer 6: 0 normal (D). II. The hemoglobin has been treated with a denaturing solution which disrupts quaternary structure only, and has a binding affinity resembling myoglobin. The binding affinity curve would look…
- Following several days at high altitude the body responds to the decreased oxygen content of the atmosphere by increasing the amount of 2,3-bisphosphoglycerate it produces. Based on this information and refering to the graph below, identify the correct response from the options. Y (fraction saturation) 1.0 0.8 0.6 0.4 0.2 0.0 0 20 Oxygen Binding plot 40 60 p02 (torr) 80 100 A) Curve y=high altitude and gives a greater release of oxygen to the tissues B) Curve x = high altitude and gives a greater release of oxygen to the tissues C) Curve y=high altitude and allows more oxygen to be bound at low oxygen levels D) Curve x = high altitude and allows more oxygen to be bound at low levelswhich of adult haemoglobin or foetal haemoglobin will have a lower P50 value for binding O2. Be sure to define the term P50 and mention at a molecular level what interactions and structure differences are contribute to the observed values.To demonstrate an understanding of oxyhemoglobin binding, insert a word from the list in each blank to complete the statements. Not all terms will be used. increased A right shift of the oxy-hemoglobin curve signifies a affinity for oxygen. hold acidic A temperature will cause a right shift of the oxy- hemoglobin curve. basic A more pH than normal blood pH will cause a right shift higher of the oxy-hemoglobin curve. As a person exercises, their muscles give off heat which raises the temperature of the blood. This will cause hemoglobin to more oxygen at the cells. lower release decreased
- The illustration below shows several oxygen-dissociation curves. Assume that curve 3 corresponds to hemoglobin with physiological concentrations of CO2 and 2,3-BPG at pH 7. Which curves represent each of the following perturbations? Saturation (Y) N P⁰₂ Loss of quaternary structure. Increase in 2,3-BPG Decrease in CO₂ 1. 1 2. 2 3. 3 4. 4O, saturation curve is shown beloww for hemoglobin at various pHs. Detail this Bohr effect from the molecular perspective. Be sure to include discussion of what causes this (i.e. specific amino acids), why the curves are right shifted with decreasing pH, and why this is logical in delivery of 02 to areas of higher demand. 100 Myoglobin 80- pH 7.6 60 pH 7.4 pll 7.2 40- pH 7.0 pH 6.8 20- Venous 0- 0. 20 10 60 80 Percent saturationExposure to air containing 600 ppm CO for 30 minutes results In an actual HbCO blood concentration of 10%. Estimate the percentage of the equilibrium saturation value of HbCO.
- Below is a fractional saturation curve for O₂ binding to adult hemoglobin. Assume that curve Y represents a condition at pH 7.4 and with a normal physiological level of 2,3-BPG. Curve X represents a condition that Fractional saturation (0) 0.2 0.0 0 Tissue PO, (kPa) 12 LungsThe O2-binding curves for normal haemoglobin (Hb A) and a mutant haemoglobin (Hb Kempsey) are shown in the diagram. Which of the following statements, based on this graph, are true? 1.0 0.8 Hb/Kempsey 0.6 Hb A 0.4 0.2 0.0 20 40 60 80 100 p02 (torr) 1. Hb Kempsey has a higher affinity for O, than HbA 2. Hb Kempsey is unable to transition between the R and T states 3. Hb Kempsey demonstrates cooperative binding of oxygen. 4. Hb Kempsey's curve could be explained by a loss of nearly all the cooperative interactions between the subunits. 5. A possible explanation for the curve observed with Hb Kempsey is mutation at His HC3. 2,4,5. O 1.2,5. O 1,2,3,4,5. O 2,3,4. O 1.2.4. Y (Fraction Saturation)2,3-bisphosphoglycerate (BPG) is a negative allosteric regulator of hemoglobin that is produced in red blood cells. Normally, red blood cell levels of BPG are 5 mmol/L, yielding curve 2. Individuals acclimated to high altitudes can have BPG levels of 8 mmol/L to optimize their oxygen utilization. Saturation 2 3 S Which curve represents hemoglobin of someone living at normal altitudes? 1 2 Pos (mm Hg) 3 None of the answers are correct 2 and 3