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 h English (en)==Development==
{{Main|Heart development|Vasculogenesis|Vascular remodelling in the embryo|Fetal circulation}}
The development of the circulatory system starts with [[vasculogenesis]] in the [[embryo]]. The human arterial and venous systems develop from different areas in the embryo. The arterial system develops mainly from the [[aortic arches]], six pairs of arches that develop on the upper part of the embryo. The venous system arises from three bilateral veins during weeks 4 – 8 of [[Human embryogenesis|embryogenesis]]. [[Fetal circulation]] begins within the 8th week of development. Fetal circulation does not include the lungs, which are bypassed via the [[truncus arteriosus]]. Before birth the [[fetus]] obtains [[oxygen]] (and [[nutrient]]s) from the mother through the [[placenta]] and the [[umbilical cord]].
 h Japanese (ja)==発達==
{{Anchor|Development}}
{{Main/ja|Heart development/ja|Vasculogenesis/ja|Vascular remodelling in the embryo/ja|Fetal circulation/ja}}
循環器の発達は[[embryo/ja|胚]]の[[vasculogenesis/ja|血管新生]]から始まる。
ヒトの動脈系と静脈系は胚の異なる部位から[[Human embryogenesis/ja|発生]]する。
動脈系は主に、胚の上部に発達する6対の[[aortic arches/ja|大動脈弓]]から発達する。静脈系は胎生4~8週目に3つの両側静脈から発生する。
[[Fetal circulation/ja|胎児循環]]は発生第8週以内に始まる。胎児循環には肺は含まれない、 肺は[[truncus arteriosus/ja|動脈管]]を通ってバイパスされる。
出生前、[[fetus/ja|胎児]]は[[placenta/ja|胎盤]]と[[umbilical cord/ja|臍帯]]を通して母親から[[oxygen/ja|酸素]](と[[nutrient/ja|栄養分]])を得る。