Which of the following statements are true of oxygen transport?
I.Hemoglobin allows whole blood to carry approximately 20 mL of oxygen per 100 mL of blood at the normal arterial PaO₂ of 100 mm Hg.
II.Hemoglobin's capacity to carry oxygen is approximately 67 times more than the capacity of plasma alone when PaO? is 100 mm Hg.
III.A normal cardiac output of 5 L/min delivers approximately 1000 mL of oxygen to the body's tissues each minute.
IV.The amount of oxygen delivered is not enough to meet the tissues' resting requirement.

Question

Quizplus · Accepted Answer

Hemoglobin allows whole blood (plasma plus cellular components) to carry approximately 20 mL of oxygen per 100 mL of blood at the normal arterial PaO? of 100 mm Hg. This is approximately 67 times more than the capacity of plasma alone when PaO? is 100 mm Hg ([20 mL/dL]/[0.3 mL/dL] = 66.6). Thus, a normal cardiac output ( Q ) of 5 L/min delivers approximately 1000 mL of oxygen to the body's tissues each minute. This is more than enough oxygen to meet the tissues' resting requirement, which is only 250 mL/min.

Which of the Following Statements Are True of Oxygen Transport