Why Do Humans Rely on a Circulatory System to Distribute

question 13

Multiple Choice

Why do humans rely on a circulatory system to distribute oxygen?

• A)Diffusion does not occur in organisms that have more than about 300 cells.
• B)Humans do not need as much oxygen as small organisms do, so we use inefficient transport systems like the circulatory system rather than diffusion.
• C)Humans need an internal transport system in order to quickly replace oxygen that is lost because of our high surface area of skin.
• D)Diffusion is very slow over all but the shortest distances, so oxygen must be delivered to our cells to speed up the process.

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