Question 11 5 pts The structure of human hemoglobin is dependent on pH and the s

Question

Question 11 5 pts The structure of human hemoglobin is dependent on pH and the structure of hemoglobin affects the binding curve for oxygen. What effect does this have? pH 7.4. 0 80 pH 7.2 Hemoglobin retains less O2 at lower pH (higher CO2 concentration) J 60 O 40 G 20 0 0 20 40 60 80 100 Po2 (mm Hg) (b) pH and hemoglobin dissociation hemoglobin binds more oxygen in the lungs at during exercise hemoglobin binds more oxygen in the lungs when the body is at rest hemoglobin releases more oxygen in the tissues during exercise hemoglobin releases more oxygen to the tissues when the body is at rest

Explanation / Answer

Q11. During muscle activity, accumulation of lactic acid and CO2 will reduce cellular pH. As we can observe from the O2-Hb Dissociation Curve, Hemoglobin retains more O2 when pH is low. When blood carrying oxygen is taken to the tissues during exercise, the accumulated CO2/lactic acid (aerobic/anaerobic respiration) which reduces the pH of the tissues will lead to the release of more oxygen in the tissues.

So the correct option is Hemoglobin releases more oxygen in the tissues during exercise.

Q9. We can observe in the given graph, the marked area where it indicates the amount of O2 released in tissues at rest. The area covers only around 25% of the bound oxygen. Hence, the wrong option here is Hemoglobin releases about 70% of bound O2 in tissues at rest.

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