brandonromero19 brandonromero19

02-05-2018
Health

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_____ are vessels with valves that keep blood flowing in the right direction

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alkhalidisara alkhalidisara

02-05-2018

Veins have valves to make sure that blood flows in only one direction.

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krystieee3 krystieee3

02-05-2018

the aorta and the pulmonary artery.

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