While a Runner Rests Before a Race, the Hemoglobin in the Blood

question 98

Multiple Choice

While a runner rests before a race, the hemoglobin in the blood returning to her heart is 75% saturated with oxygen.While she is running, this percentage

• A) stays the same because hemoglobin is usually 75% saturated with oxygen.
• B) increases because she is breathing harder.
• C) increases because her muscles need more oxygen.
• D) decreases because the decreased PO₂ in her muscles makes it easier for additional oxygen to be released from the hemoglobin.
• E) decreases because the partial pressure of oxygen in her alveoli is reduced below 40 mm Hg.

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