How are capillaries specialized for the exchange of respiratory gases?

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    The capillary walls are only one cell thick.
    The capillary walls are wrapped in a layer of smooth muscle.
    They allow the passage of fluids through spaces between the cells.
    They have one-way valves.
    Both the first and third answers are correct.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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Both the first and third answers are correct.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)



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