8. Which of the following statements are accurate?
A. In an average, healthy human, the partial pressure of carbon dioxide is usually higher in the body tissues than the systemic arteries.
B. In an average, healthy human, the partial pressure of oxygen is usually higher in the pulmonary arteries than in the body tissues.
C. Generally speaking, gases will diffuse up their pressure gradient
D. In an average, healthy human, the partial pressure of carbon monoxide is usually higher in systemic veins than the alveoli
E. In an average, healthy human, the partial pressure of oxygen is usually higher in the systemic veins than the alveoli