portal circulation


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Related to portal circulation: hepatic portal circulation

por·tal cir·cu·la·tion

1. circulation of blood to the liver from the small intestine, the right half of the colon, and the spleen through the portal vein; sometimes specified as the hepatic portal circulation;
2. more generally, any part of the systemic circulation in which blood draining from the capillary bed of one structure flows through a larger vessel(s) to supply the capillary bed of another structure before returning to the heart; for example, the hypothalamohypophysial portal system.

por·tal cir·cu·la·tion

(pōr'tăl sĭr'kyū-lā'shŭn)
1. Circulation of blood to the liver from the small intestine, the right half of the colon, and the spleen through the portal vein; sometimes specified as the hepatic portal circulation.
2. More generally, any part of the systemic circulation in which blood draining from the capillary bed of one structure flows through a larger vessel(s) to supply the capillary bed of another structure before returning to the heart, e.g., the hypothalamohypophysial portal system.
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HEPATIC PORTAL CIRCULATION

portal circulation

1. Blood flow from the abdominal organs that passes through the portal vein, the sinusoids of the liver, and into the hepatic vein before returning to the heart from the inferior vena cava. This pathway permits the liver to process and to detoxify substances entering the body from the gastrointestinal tract.
2. A portal system between the hypothalamus and the anterior pituitary gland. The hypothalamus secretes releasing or inhibiting hormones into the blood; they are carried directly to the anterior pituitary and stimulate or inhibit secretion of specific hormones.
See: Hepatic Portal Circulation illustration
See also: circulation
References in periodicals archive ?
Ammonia is shunted directly to the liver via the portal circulation where most is metabolized to urea at the hepatocyte Krebs-Hanseleit urea cycle.
St.-Onge explained that MCTs don't need to be repackaged into triglycerides and chylomicrons for transportation to the liver; they travel through the portal circulation, bypassing peripheral tissues.
(25.) Taurel P, Blanc P, Dauzat M, Chabre M, Pradel J, Gallix B, et al.Doppler study of mesenteric, hepatic, and portal circulation in alcoholic cirrhosis: relationship between quantitative Doppler measurements and the severity of portal hypertension and hepatic failure.
Orally administered estrogens or other steroids are delivered directly into the portal circulation via gut absorption, Dr Liu reminded the audience.