Which Statement Is the Most Accurate Definition of External Respiration

question 29

Multiple Choice

Which statement is the most accurate definition of external respiration?

• A) Bulk flow (convection) of air or water to and from the gas-exchange membrane.
• B) The process by which O₂ is transported to the gas-exchange membrane from the environmental medium and by which CO₂ is transported away from the membrane into the environmental medium.
• C) The process by which CO₂ is transported to the gas-exchange membrane from the environmental medium and O₂ is transported away from the membrane into the environmental medium.
• D) Diffusion of O₂ and CO₂ across the gas exchange membrane.

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