The most important aspect of delivering oxygen from the lung to the muscle is the... Group of answer choices arterial-venous oxygen difference observed in the body the pressure gradient or driving force of oxygen across the tissues in the body percentage of oxygen in the air percentage of oxygen in the muscle
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Oxygen is transported from the lungs to the muscles through the bloodstream, where it is utilized for energy production. Show more…
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While a runner rests before a race, the hemoglobin in the blood returning to her heart is 75% saturated with O2 (that is, the blood is carrying about 75% of the maximum possible capacity to carry O2). While she is running, this percentage ... A. increases because her muscles need more O2. B. decreases because the partial pressure of O2 in her lung alveoli is reduced to below 40 mm Hg. C. increases because she is breathing harder. D. decreases because the decreased PO2 in her muscles promotes O2 unloading in those tissues. E. stays the same because hemoglobin is usually 75% saturated with O2.
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