brandonromero19
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 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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