The partial pressure of oxygen in the air within the alveoli is $14\ \text{kPa}$. The partial pressure of oxygen in the pulmonary capillaries is $6\ \text{kPa}$. How will these partial pressures affect diffusion?
- ACarbon dioxide will not diffuse in any direction.
- BOxygen will diffuse from alveoli into capillaries.
- COxygen will diffuse from capillaries into alveoli.
- DOxygen will diffuse equally in both directions.