Medical MCQ-Which of the following ranges of haemoglobin O2 saturation from systemic venous to systemic aerial blood represents a normal resting condition?

Which of the following ranges of haemoglobin O2 saturation from systemic venous to systemic aerial blood represents a normal resting condition?

25 to 75%

40 to 75%

40 to 95%

75 to 98%

Question Category:

Pathology

Correct Answer:

75 to 98%

Description:

In a normal res ng condition, the blood leaving the lungs is 98% saturated with oxygen, and the blood returning to the lungs is 75% saturated with oxygen. With vigorous exercise, blood leaving the lungs is still 98% saturated, but blood returning is usually less than 75% saturated because more oxygen is unloaded from hemoglobin in exercising muscles

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