20.3 Capillary Exchange

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4 Terms

1
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The function of capillaries

to allow for the exchange of substances (respiratory gases, nutrients, wastes, hormones) between the blood and the surrounding tissues.

2
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Exchange processes of the capillaries

  • diffusion

  • vesicular transport

  • bulk flow.


3
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Within systemic capillaries, substances (oxygen, hormones, and nutrients) move by

diffusion

from their relatively high concentration in the blood into the interstitial fluid and then into the tissue cells, where the concentration of these materials is lower.

4
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Carbon dioxide and waste products diffuse from the higher concentration in the tissue cells to the lower concentration in the

interstitial fluid then to the blood.