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NameCurrent message text
 h English (en)==Structure==
{{anchor|Human cardiovascular system}}
[[File:2101 Blood Flow Through the Heart.jpg|thumb|350px|Blood flow in the pulmonary and systemic circulations showing capillary networks in the torso sections]]
The circulatory system includes the [[heart]], [[blood vessel]]s, and [[blood]]. The '''cardiovascular system''' in all vertebrates, consists of the heart and blood vessels. The circulatory system is further divided into two major circuits – a [[pulmonary circulation]], and a [[systemic circulation]]. The pulmonary circulation is a circuit loop from the [[right heart]] taking deoxygenated blood to the [[lung]]s where it is oxygenated and returned to the [[left heart]]. The systemic circulation is a circuit loop that delivers oxygenated blood from the left heart to the rest of the body, and returns deoxygenated blood back to the right heart via [[Great vessels|large veins]] known as the [[venae cavae]]. The systemic circulation can also be defined as two parts – a ''macrocirculation'' and a ''[[microcirculation]]''. An average adult contains five to six quarts (roughly 4.7 to 5.7 liters) of blood, accounting for approximately 7% of their total body weight. Blood consists of [[Blood plasma|plasma]], [[red blood cells]], [[white blood cells]], and [[platelets]]. The [[digestive system]] also works with the circulatory system to provide the nutrients the system needs to keep the [[heart]] pumping.
 h Japanese (ja)==構造==
{{anchor|Human cardiovascular system}}
[[File:2101 Blood Flow Through the Heart.jpg|thumb|350px|胴体部の毛細血管網を示す肺循環と全身循環の血流。]]
循環器系には[[heart/ja|心臓]]、[[blood vessel/ja|血管]]、[[blood/ja|血液]]が含まれる。すべての脊椎動物の'''循環器系'''は心臓と血管からなる。循環系はさらに、[[pulmonary circulation/ja|肺循環]]と[[systemic circulation/ja|体循環]]の2つの主要な回路に分けられる。肺循環は、[[right heart/ja|右の心臓]]から脱酸素された血液を[[lung/ja|肺]]に送り、そこで酸素化された血液を[[left heart/ja|左の心臓]]に戻すループである。体循環は、酸素化された血液を左心臓から全身に送り、脱酸素化された血液を[[venae cavae/ja|静脈]]と呼ばれる[[Great vessels/ja|太い静脈]]を経由して右心臓に戻すループである。体循環はまた、''大循環''と''[[microcirculation/ja|微小循環]]の2つの部分として定義することもできる。平均的な成人の血液量は5~6クォート(約4.7~5.7リットル)で、体重の約7%を占める。血液は[[Blood plasma/ja|血漿]]、[[red blood cells/ja|赤血球]]、[[white blood cells/ja|白血球]]、[[platelets/ja|血小板]]で構成されている。[[digestive system/ja|消化器系]]も循環器系と連携し、[[heart/ja|心臓]]のポンプ機能を維持するために必要な栄養素を供給している。