The part of the cardiovascular system consisting of all venous vessels. In vertebrates with a double circulation, this can be divided into systemic and pulmonary portions. [ ]

Synonyms: vein system

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Term information

homology notes

The appearance of Chordata and subsequently the vertebrates is accompanied by a rapid structural diversification of this primitive linear heart: looping, unidirectional circulation, an enclosed vasculature, and the conduction system.[well established][VHOG]