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Type: Multiple-Choice
Category: Circulatory and Immune Systems
Level: Grade 8
Score: 3
Tags: Cardiovascular system
Author: Severud
Last Modified: a month ago

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Circulatory and Immune Systems Question

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Grade 8 Circulatory and Immune Systems

Capillaries have thin walls that allow
  1. oxygen and nutrients to flow out of the blood to the cells.
  2. blood to flow in very narrow places.
  3. cuts to heal quickly.
  4. blood to stop flowing if needed.
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