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Message definition (Circulatory system ) The general rule is that arteries from the heart branch out into capillaries, which collect into veins leading back to the heart. [[Portal venous system|Portal veins]] are a slight exception to this. In humans the only significant example is the [[hepatic portal vein]] which combines from capillaries around the [[gastrointestinal tract]] where the blood absorbs the various products of digestion; rather than leading directly back to the heart, the hepatic portal vein branches into a second capillary system in the [[liver]].
一般的には、心臓から出た動脈は毛細血管に分岐し、その毛細血管が集まって心臓に戻る静脈になる。門脈 はこのわずかな例外である。ヒトの場合、唯一の重要な例は肝門脈 であり、血液が消化産物を吸収する消化管 周辺の毛細血管から合流する；
肝門脈は直接心臓に戻るのではなく、肝臓 で第二の毛細血管系に分岐する。