Respuesta :
Answer: The direction of gas movement is determined by partial pressure differences. 2) At the arterial end of the pulmonary capillaries, O2 diffuses from the alveoli into the blood, while CO2 diffuses from the blood into the alveoli.
Explanation:
→ Oxygen and carbon dioxide diffuse across a respiratory membrane.
Factors determining gas movement:
- The concentration gradient of the gases and the partial pressure of the gases.
- The differences in concentration on either side of the cell membrane.
→ In diffusion of gases:
- The amount of surface area available for diffusion.
- The distance the gas particles must travel.
- The higher the concentration gradient across the gas-exchanging surface, the faster the rate of diffusion across it.
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