Question: please Question 21 (1 point) Below is a graph of an oxygen-haemoglobin dissociation curve. 100 90 80 70 Hemoglobin saturation, % 68968 8 0 20

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Question 21 (1 point) Below is a graph of an oxygen-haemoglobin dissociation curve. 100 90 80 70 Hemoglobin saturation, % 68968 8 0 20 40 60 80 100 Resting cell Alveoli Po, (mm Hg) (a) When the Poz is 20 mmHg, what is the percentage (%) saturation of haemoglobin? (b) At what Po2 is haemoglobin 50% saturated with oxygen? (1 mark) O (a) ~ 20; (b) ~30 O (a) ~70 ; (b) ~40 (a) ~40 ; (b) ~20 O (a) ~30 ; (b) ~30

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