21.Gasses diffuse over the Respiratory surface because of A. p02 is more in alveoli than in blood B. p02 is more in blood than in tissues C. pCO2 is more in alveoli than in blood D. pCO2 is more in blood than in tissues
Option A The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries. oxygen diffuses across the respiratory membrane from the alveoli into the blood. The partial pressure of carbon dioxide is high in the pulmonary capillaries and low in the alveoli.
