During an investigation, a student from Barbados measured the partial pressure of carbon dioxide in different locations. Which of the following correctly shows the relative partial pressure of carbon dioxide?

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Question

During an investigation, a student from Barbados measured the partial pressure of carbon dioxide in different locations. Which of the following correctly shows the relative partial pressure of carbon dioxide?

Accepted Answer

Tissue cells > Blood in capillaries > Alveoli — Award 1 mark for correct sequence showing carbon dioxide diffuses from tissues (highest) to alveoli (lowest). A is incorrect — alveoli have the lowest CO₂. C is incorrect — reverses the gradient direction. D is incorrect — tissue cells produce CO₂ so have the highest concentration.

Answer

Blood in capillaries > Alveoli > Tissue cells

Answer

Alveoli > Blood in capillaries > Tissue cells

Answer

Tissue cells > Blood in capillaries > Alveoli

Answer

Alveoli > Tissue cells > Blood in capillaries

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