Question

1.Reason for the diffusion of oxygen from alveoli to blood.
A. Low concentration of oxygen in blood.
B. As the walls of the alveoli and blood vessels are thin.
C. High concentration of oxygen in alveoli.
D. All the above.
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Answer 1

Answer:

all of these

Explanation:

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Answer 2

Answer:

The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries. As a result, oxygen diffuses across the respiratory membrane from the alveoli into the blood.