almerzsam7a9rti almerzsam7a9rti

05-05-2017
Health

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Challenge: Explain why the capillaries are the most important blood vessels in the circulatory system. Explain how their structure assists them in accomplishing their functions.

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brainy891 brainy891

05-05-2017

this is where gas exchange of oxygen and carbon dioxide occurs this is possible because of the air sac structures with in the capillaries

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