This figure shоws the frаctiоn оr percent of myoglobin or hemoglobin O2 binding sites occupied on the y-аxis аs a function of O2 partial pressure shot on the x-axis. The middle Hb blue curve is for normal Hb. The right-hand red Hb curve reflects the shift in the bonding affinity of Hb in response to a drop in pH, whereas the left-hand green Hb curve reflects the change in response to an increase in pH. Diagram citation Wikimedia Commons (Public Domain) Image Description Graph depicting hemoglobin oxygen saturation percentage against oxygen partial pressure (mmHg). Three curves represent different pH levels: green for pH 7.8 (alkalosis hypocapnia), blue for pH 7.4 (normal), and red for pH 7.0 (acidosis hypercapnia). The y-axis ranges from 0 to 100%, indicating hemoglobin oxygen saturation, while the x-axis ranges from 0 to 120 mmHg, indicating oxygen partial pressure. The curves show the relationship between oxygen binding and blood pH. Which of these curves shows the greatest affinity for O2? (1 pt.) Which one of the two shifted Hb curves, right or left, would result in the release of the most O2 to the cells, if the lung pO2 decreases from 100 torr to 60 torr and the pO2 of the tissues remains the same at 27 torr? Briefly justify your answer. (2 pts.)
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