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Circulatory System

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Across
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Human blood has a lot of
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Human blood is ______ and always red
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Vein under your skin appear to be ______ or green
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Major artery that carries oxygenated blood to the body
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Blood enters the heart through the
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How many chambers does the heart have
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Which blood cells fight off infections
Down
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The _______ system is absolutely fascinating
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Red blood cells have iron-containing protein called
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Carries blood away from the heart
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Human heart ______ over 100,000 times a day
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Carries blood to the hear