Practice Quiz

MCAS Biology Practice

Category - Biology

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Which of the following statements best explains why oxygen diffuses from the alveoli into the blood?
  1. The diaphragm draws oxygen into the alveoli at a rapid speed.
  2. Alveoli cells contain hemoglobin to transfer gases to the blood.
  3. The concentration of oxygen is greater in the alveoli than in the blood.
  4. Red blood cells move one at a time through the capillaries surrounding the alveoli.
Explanation
Answer: C - The concentration of oxygen is greater in the alveoli than in the blood.
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