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	<title>Translations:Circulatory system/44/en - Revision history</title>
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	<updated>2026-05-21T09:27:15Z</updated>
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		<updated>2023-10-19T08:10:35Z</updated>

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While humans, as well as other [[vertebrates]], have a closed blood circulatory system (meaning that the blood never leaves the network of arteries, veins and capillaries), some [[invertebrate]] groups have an open circulatory system containing a heart but limited blood vessels. The most primitive, [[diploblastic]] animal [[phylum|phyla]] lack circulatory systems.&lt;/div&gt;</summary>
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