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Type: Multiple-Choice
Category: Circulatory and Immune Systems
Level: Grade 8
Author: Gem221984
Last Modified: a month ago

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Circulatory and Immune Systems Question

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Grade 8 Circulatory and Immune Systems

What part do valves play in the circulatory system?
  1. to speed up blood flow
  2. to slow down blood flow
  3. to keep blood flowing in the same direction
  4. to increase the amount of oxygen around the body
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