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Name	Current message text
^h English (en)	====Coronary circulation==== {{Main\|Coronary circulation}} The heart itself is supplied with oxygen and nutrients through a small "loop" of the systemic circulation and derives very little from the blood contained within the four chambers. The coronary circulation system provides a blood supply to the [[myocardium\|heart muscle]] itself. The coronary circulation begins near the origin of the aorta by two [[coronary arteries]]: the [[right coronary artery]] and the [[left coronary artery]]. After nourishing the heart muscle, blood returns through the coronary veins into the [[coronary sinus]] and from this one into the right atrium. Backflow of blood through its opening during [[atrial systole]] is prevented by the [[Thebesian valve]]. The [[smallest cardiac veins]] drain directly into the heart chambers.
^h Japanese (ja)	====冠動脈循環==== {{Main/ja\|Coronary circulation/ja}} 心臓自体は、体循環の小さな "ループ"を通じて酸素と栄養を供給され、4つの部屋の中にある血液からはほとんど栄養を得られない。冠循環は[[myocardium/ja\|心筋]]そのものに血液を供給する。冠動脈循環は、大動脈の起始部付近から[[right coronary artery/ja\|右冠動脈]]と[[left coronary artery/ja\|左冠動脈]]の2本の[[coronary arteries/ja\|冠動脈]]によって始まる。心筋に栄養を与えた後、血液は冠静脈を通って[[coronary sinus/ja\|冠静脈洞]]に戻り、ここから右心房に入る。[[atrial systole/ja\|心房収縮期]]の血液の逆流は、[[Thebesian valve/ja\|テーベ弁]]によって阻止される。[[smallest cardiac veins/ja\|最も細い心臓静脈]]は直接心室に流れ込む。