the function of the hepatic portal circulation is to .

What is the function of the hepatic portal circulation? - QuoraSystem of liver portals The vein of the liver portal and its territoryDetailsLocation[ ]In , the system of the liver portal is the system of compounds and their tributaries. It is also called the portal venous system (although it is not the only example of one) and the splanonic veins, which is not with the liver portal system and is imprecise (as it means veins and not necessarily the veins of the viscera). portal hepatic systemportal venous systemsplanchnic venous venous venous venous venous venous venous veinsContentsStructure[ ]The highest veins considered part of the portal venous system are the following: He and he come together to form the real. The connections in most people in the , but in some people, it is known that they connect in the or . Approximately, the portal venous system corresponds to the areas supplied by , , and . Function[] The portal venous system is responsible for directing blood from parts to . Substances absorbed in the small intestine travel first to the liver to process before proceeding to the heart. Not all this is part of this system. The system extends from approximately the bottom of the upper part of the . It also includes venous drainage of the y . venous system The evolutionary purpose of the first leg metabolism, by which the substances absorbed from the food in the intestine pass through the liver before entering the systemic circulation, is to use the liver as a shield (a first line of defense) between (a) the food, its toxins (anything they are), and its metabolic intermediaries/ (such as ammonia) and (b) the rest of the tissues in the brain. The need for such a system is demonstrated by what happens when the system breaks down, as seen when advanced liver fibrosis in the brain leads to the blood that is loaded with ammonia and other substances that do not lead to brain function. Blood flow to the liver is unique in that it receives both oxygenated and (partially) deoxigenated blood. As a result, the oxygen pressure (pO2) and the perfusion of the portal blood are lower than other organs in the body. The blood passes from branches of the portal vein through cavities between "placas" of call. The blood also flows from the branches of the sinusoids and mixes in the hepatocytes to supply oxygen to the hepatocytes. This mixture through the sinusoids and collects in a central vein that drains in the . The liver vein is drained later in the . The percentage provides 30 to 40% of the oxygen to the liver, while it represents only 25% of the total blood flow of the liver. The rest comes from the partially deoxigenated blood of the . The liver consumes about 20% of the total oxygen of the body when it is at rest. That is why the total flow of liver blood is quite high, approximately 1 liter per minute and up to two liters per minute. That's on average a quarter of the average resting. Clinical significance[] is a condition in which the blood pressure of the portal venous system is too high. It is often the result of the liver. The metabolism of drugs[]Many drugs that are absorbed through are substantially metabolized by the liver before reaching general circulation. This is known as . As a result, certain drugs can only be taken by certain routes. For example, you cannot swallow because the liver would deactivate the medication, but you can take or transdermally (through the skin) and therefore it is absorbed in a way that exceeds the portal venous system. Conversely, a cough suppressor, is better taken orally because it needs to be metabolized by the liver to be effective. This last principle is that of most. The use of is a way to partially avoid the : the 1/3 higher of the drain in the while the 2/3 lower drain in which it goes directly into the (so, disappearing the liver). ########################################################################################################################################################################################################################################################## (A IVC or left kidney vein) Without paying .mw-parser-output .nobold{font-weight:normal}posterior: previous () Direct A IVC or left kidney vein Without paying .mw-parser-output .nobold{font-weight:normal}posterior: previous Without paying .mw-parser-output .nobold{font-weight:normal}posterior: previous .mw-parser-output .nobold{font-weight:normal}posterior: previous Direct External links[] Navigation menu Personal tools Named spaces Variants Views More Search Navigation Contributed Tools Printing/exporting Languages

Portal venaPortal vein The portal vein and its tributaries. It is formed by the , lower mesenteric vein, and . The Lienal vein is an ancient term for the splenic vein. DetailsThe images of, , Source , , Drains toIdentifiersvena portae hepatis[] venaportal The portal vein or the hepatic portal vein (HPV) is one that carries from the , , and to the . This blood contains and extracts from digested contents. Approximately 75% of the total flow of liver blood is through the portal vein, with the rest coming from the . Blood leaves the liver to the heart in . portal venhepatic portal vein HPV The portal vein is not a true one, because it leads blood to beds in the liver and not directly to the heart. It is an important component of the , one of the only two in the body - with the being the other. The portal vein is usually formed by the confluence of the , , , and . The conditions that involve the portal vein cause considerable disease and death. An important example of such a condition is high in the portal vein. This condition, called, is an important complication of . ContentEstruture[] Measured about 8 cm (3 inches) in adults, the portal vein is found in the abdomen, originating behind the neck of the . In most individuals, the portal vein is formed by the union of the and the . For this reason, the portal vein is occasionally called the splenic-mesentary confluence. Occasionally, the portal vein also communicates directly with the , although this is very variable. Other affluents of the portal vein include the and the and . and also pararumbilical vein and prepyloric vein. plenic-mensential confluence Tribes of the vein of the liver portal Immediately before reaching the liver, the portal vein is divided into right and left. It is branched more, forming smaller vein branches and ultimately venules portals. Each portal vein extends along with a liver artery and the two vessels form the vascular components of the . These vessels eventually empty in the blood supply to the liver. Portacaval anastoms[]He has several with the . In the cases of these anastamosa can fatten, dilate, or varicosed and then break. Accessory liver portal veins[ ] Access liver veins are those veins that drain directly into the liver without joining the vein of the liver portal. These include veins and veins of the , , and those that drain the wall. Function[] The portal vein and forms the supply of dual blood from the liver. About 75% of the blood flow is derived from the portal vein, while the rest is from the liver arteries. Unlike most veins, the portal vein does not drain into the . Rather, it is part of one that delivers the venous blood in another, the liver. By taking venous blood from the tract to the liver, the portal vein performs two tasks: it supplies the liver with metabolic substrates and ensures that ingested substances are processed first by the liver before reaching the . This accomplishes two things. First, possible toxins that can be ingested can be detoxified by hepatocytes before they are released into the systemic circulation. Second, the liver is the first organ to absorb the nutrients that has just taken the . After draining into the liver, the blood of the liver is drained by the . Clinical significance[] portal hypertension[]Increased in the portal vein, called, is an important complication of liver disease, more commonly. A dilated portal vein (diameter of more than 13 or 15 mm) is a sign of portal hypertension, with an estimated 12.5 or 40%. In , the main portal vein (MPV) systolic peak speed normally ranges between 20 cm/s and 40 cm/s. A slow speed of ≤6 cm/s in addition to dilation in the MPV are diagnosis of portal hypertension. Portal hypertension clinic includes chronic liver disease: , , , and . Pulsatility[]maxminPortal pulsatility vein can be measured by . A greater pulsatility can be caused by , as well as a higher right-hand head pressure (which can in turn be caused by the right or ). Pultility of the portal vein can be quantified by pulse rate (PI), where an index above a certain cut indicates pathology: Pulse indices (PI) Contents Calculation Court Average base (Max - Min) / Medium 0.5 Max base (Max - Min) / Max 0.5-4 The infection[] is the infection of the portal vein, usually derived from an infectious intraabdominal process like [[diverticulitis] Venous Gas Portal[]The venous liver portal gas is a rare finding in radiological examinations. The gas is shown to enter the portal venous system. It is more commonly caused by intestinal ischemia, but it has also been associated with colon cancer. Venous gas portalReferences[]abcdabc12abcde35ab34ab1218696Additional images[] human embryo with the heart and the previous body removed to show the sinus venosus and its tributaries. Section through pig. Longitudinal section of a small portal and channel vein. Come from the liver portal. Localization technique. Come from the liver portal. Abdominal cavity. Deep dissection. Come from the liver portal. Visceral surface of the liver. ########################################################################################################################################################################################################################################################## → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → ( → → → → → → → () of the system and the system (A IVC or left kidney vein) Without paying .mw-parser-output .nobold{font-weight:normal}posterior: previous () Direct A IVC or left kidney vein Without paying .mw-parser-output .nobold{font-weight:normal}posterior: previous Without paying .mw-parser-output .nobold{font-weight:normal}posterior: previous .mw-parser-output .nobold{font-weight:normal}posterior: previous Direct Navigation menu Personal tools Named spaces Variants Views More Search Navigation Contributed Tools Printing/exporting Other projects Languages

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