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Kaplan Qbank USMLE



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What is the physiology behing increased affinity of a substance such as CO to HB?

What is happening to the O2 that is normally bound to the HB?Does it get displaced?If so where?

What happens when PO2 decreases??What is P50?What is O2 saturation?

I am really being pulled down in these questions..It would be of great help if somebody explains in detail about the PO2 and Hb affinity..








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