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CIRCULATORY SYSTEM Humans have a closed circulatory system consisting of a four-chambered heart end E hiEhIy complex loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentsmxreader034viewer20220427125fa5b3d5930bf452a630b6e4html5thumbnails5jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imageimg data-url=scarsdale-public-schools-activity-6-3-parts-of-the-human-circulatory-systemhtmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: Scarsdale Public Schools OvervieACTIVITY 6-3 PARTS OF THE HUMAN CIRCULATORY SYSTEM Humans have a closed circulatory system consisting of a four-chambered heart end E hiEhIy complex loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC 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