Which of the following statements is true regarding partial pressure and the diffusion of gases in the body?
a. In internal respiration, the PCO₂ in the systemic capillary is 40, while the PCO₂ in the interstitial fluid is 45.
b. The partial pressure of oxygen in the systemic capillary is 40 mm of Hg before it moves into the interstitial fluid.
c.The partial pressure of oxygen in the pulmonary circulation as it returns to the heart is 95 mm of Hg.
d. If the partial pressure of oxygen in the interstitial fluid is lower than the partial pressure of carbon dioxide in the interstitial fluid, carbon dioxide will not diffuse from the interstitial fluid into the systemic circulation.
e. Internal respiration involves the diffusion of oxygen from the alveolus into the pulmonary capillary.