Question

At a PO2 of 70 mmHg and normal temperature and pH, hemoglobin is ________ percent saturated with oxygen.a.

a.75
b.50
c.10
d.25
e.more than 90

Answer 1

Hemoglobin is more than 90 percent saturated with oxygen at a PO2 of 70 mmHg with normal temperature and pH. This reflects a high oxygen affinity by hemoglobin as depicted on the oxygen-hemoglobin dissociation curve.

Step-by-step explanation:

At a PO2 of 70 mmHg and normal temperature and pH, hemoglobin is more than 90 percent saturated with oxygen. The oxygen-hemoglobin dissociation curve illustrates that as the partial pressure of oxygen (PO2) increases, the percent saturation of hemoglobin with oxygen increases in an S-shaped curve. Around a PO2 of 60 mmHg, the curve levels off, meaning that further increases in oxygen concentration do not significantly increase the saturation because hemoglobin is already nearly fully saturated. This effect reflects a high affinity of hemoglobin for oxygen at these moderate to high PO2 levels. Therefore, in standard conditions with a PO2 of 70 mmHg, hemoglobin will be more than 90% saturated, reflecting a high percent sat or saturation level in the blood.