Question

Why oxygen diffuse into the blood cappilllaries in th lungs but outside of the blood cappilaries in the tissue

Answer 1

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. In contrast, the partial pressure of carbon dioxide is high in the pulmonary capillaries and low in the alveoli.