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Doctors Medicines MCQs Q&A

Which of the following hypotheses is best supported by the data presented in the graph?

Which of the following hypotheses is best supported by the data presented in the graph? Correct Answer More oxygen is released by hemoglobin in tissues where respiration is high.

A. When respiration is high, more CO2 is produced. As CO2 enters the blood, it diffuses into red blood cells, where the enzyme carbonic anhydrase combines the CO2 with H2O to form H+ and HCO3-. These ions return to the blood, where the increase in H+ lowers the pH (makes it more acidic). Thus, the lower plot, representing a more acidic (than normal) blood, corresponds with tissues where respiration is higher. The lower plot indicates a lower hemoglobin saturation. So this graph supports the hypothesis that more oxygen is released in tissues where respiration is high.

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