| 单词 | portal system |
| 释义 | > as lemmasportal system portal system n. (a) the system of blood vessels consisting of the portal vein with its tributaries from the stomach, intestines, and spleen, and its branches within the liver; (b) (chiefly with distinguishing word) any other system of blood vessels in which blood is conveyed from one capillary network to another. ΘΚΠ the world > life > the body > vascular system > blood vessel > vein > [noun] > system of > specific system portal system1754 1754 S. Mihles tr. A. von Haller Physiol. II. 453 In many slow or lingering..fevers, small repeated boles..will bring out by day a good deal of the matter lurking in the mesentery and portal system. 1833 Philos. Trans. (Royal Soc.) 123 744 Branches of the hepatic artery and portal vein..must therefore be considered as separate branches of the abdominal portal system. 1974 M. Hildebrand Anal. Vertebr. Struct. xii. 262 In several places in the body (digestive organs, kidneys, hypophysis) blood that has passed a capillary bed elsewhere enters a second capillary bed before reaching the heart. The veins between two capillary networks constitute a portal system. 2001 Proc. National Acad. Sci. U.S.A. 98 8160/2 Absorbed iron is bound to circulating transferrin and passes initially through the portal system of the liver. < as lemmas |
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