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Message definition (Circulatory system ) {{multiple image | align = right | direction = vertical | width = 220 | header = Circulation in vertebrates | header_align = center | header_background = | footer = | footer_align = <!-- left/right/center --> | footer_background = | background color = | image1 = | alt1 = | caption1 = {{center|''Fish, amphibians and mammals''}}'''1''': heart{{right|{{bg|#000066| }} venous blood }}<br />'''2''': [[Systemic circulation|systemic]]{{right|{{bg|#FF0000| }} arterial blood }}<br />'''3''': [[Pulmonary circulation|pulmonary]]{{right|{{bg|#00CCFF| }} mixed blood }} }} 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.
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 phyla lack circulatory systems.