The Movement of O₂ and CO₂ Between the Blood in the Tissue

question 245

Multiple Choice

The movement of O₂ and CO₂ between the blood in the tissue capillaries and the cells in tissues depends most directly upon

• A) active transport of O₂ and CO₂.
• B) total atmospheric (barometric) pressure differences across the cell membranes.
• C) diffusion of O₂ and CO₂ down a concentration gradient.
• D) diffusion of O₂ and CO₂ down a partial pressure gradient.
• E) osmosis across cell membranes.

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