Not forgeting that it's different to all other veins, in that it passes from the stomach to the liver.Some books say it does some say it doesnt.Who is correct?
2006-10-05 10:57:25 · 15 answers · asked by lavito 3 in Science & Mathematics ➔ Medicine
Blood of the hepatic portal vein is de-oxygenated blood.All of the blood which passes through the intestine and spleen is delivered to the liver by the hepatic portal vein for detoxification.
The liver also receives arterial blood, carrying oxygen, from the hepatic artery.
Blood flow to the liver is unique in that it receives both oxygenated and deoxygenated blood. As a result, portal blood has lower pO2 and perfusion pressure than the other organs of the body. Blood passes from branches of the portal vein through cavities between "plates" of hepatocytes called sinusoids. Blood also flows from branches of the hepatic artery and mixes into the sinusoids to supply the hepatocytes with oxygen. This mixture percolates through the sinusoids and collects in a central vein which drains into the hepatic vein. The hepatic vein subsequently drains into the inferior vena cava.
2006-10-05 12:05:27 · answer #1 · answered by ♥ lani s 7 · 1⤊ 2⤋
Blood flow to the liver is unique in that it receives both oxygenated and deoxygenated blood. As a result, portal blood has lower pO2 and perfusion pressure than the other organs of the body. Blood passes from branches of the portal vein through cavities between "plates" of hepatocytes called sinusoids. Blood also flows from branches of the hepatic artery and mixes into the sinusoids to supply the hepatocytes with oxygen. This mixture percolates through the sinusoids and collects in a central vein which drains into the hepatic vein. The hepatic vein subsequently drains into the inferior vena cava.
By definition, veins carry deoxygenated blood. Exception- Pulmonary vein (from the lungs to the heart) carries oxygenated blood. Similarly, arteries carry oxygenated blood. Exception- Pulmonary artery (from the heart to the lungs) carries deoxygenated blood.
The Liver receives blood from Portal vein (deoxygenated) and from hepatic artery (oxygenated). Deoxygenated blood flows from the liver through the hepatic vein and joins to the Inferior vena cava.
Portal Triad consists of 3 components(1) The Hepatic Portal Vein (2) The Hepatic Artery (3) Bile Ducts.
Please see the webpage for more details and images on Portal venous system.
2006-10-05 20:50:01 · answer #2 · answered by gangadharan nair 7 · 0⤊ 0⤋
I need to correct the other posters. First veins do not "by definition carry unoxgenated blood. The Pulmonary vein carries fresh red blood from the lungs to the left atrium, and the pulmonary artery carries blue blood from the right ventricle to the lungs. NOW for the real story, veins carries blood towards the heart and arteries carries blood away from the heart. The Portal vein actually consists of three other veins the splenic vein, the inferior mesenteric vein and I cannot remember the third (sorry). The join to make up the hepatic portal vein which takes some blood from the intestines and carries it to the liver. This blood would be lower in O2 levels and rich in nutrients. The portal vein then empties into the inferior Vena Cava.
2006-10-05 19:59:39 · answer #3 · answered by mr.answerman 6 · 2⤊ 0⤋
Veins, by definition, are vessels which return blood (oxygenated or not) to the heart. For example the pulmonary veins drain oxygenated blood from the lungs into the heart, so do not make the mistake that all veins carry de-oxygenated blood.
That being said, blood flows through the vessels supplying the digestive tract, exchanging oxygen for waste (CO2) and picking up nutrients, toxins, fats, proteins, etc... and is then routed to the liver via the HPV. In the liver the blood is processed and detoxified before being returned via the vena cava to the heart for re-circulation .
As blood entering the liver via the HPV has already been circulated through the tissues it would have been responsible for oxygenating, the blood in the hepatic portal vein is deoxygenated. The liver has it's own oxygenated blood supply via the systemic circulation. Finally, keep in mind that deoxygenated blood has not lost ALL of its oxygen, but this is more of a hemodynamic physics problem not really relevant to this question.
2006-10-05 14:01:16 · answer #4 · answered by doc09 2 · 0⤊ 2⤋
Hepatic Portal Blood
2016-12-17 13:46:57 · answer #5 · answered by Erika 4 · 0⤊ 0⤋
The blood of Portal vein in deoxygenated. That vein gets all the blood from the digestve tube and carries it to the liver first and then to the heart.
2006-10-05 11:00:26 · answer #6 · answered by Anonymous · 2⤊ 0⤋
Its deoxygenated. By definition, veins carry deoxygenated blood back to the heart, and oxygenated blood leaves the heart though the arteries. Also, if you look at diagrams, the hepatic portal vein is usually depicted as blue. blue is used to depict deoxygenated blood pathways and red is used to rep present oxygenated blood pathways.
2006-10-05 11:02:01 · answer #7 · answered by Anonymous · 3⤊ 1⤋
If its an actual "vein" then it is deoxygenated. I believe arteries carry oxygenated blood from the heart to the different parts of the body and veins bring it back.
2016-03-18 05:16:22 · answer #8 · answered by Anonymous · 0⤊ 1⤋
De oxygenated,
there are some exception where veins carry oxygenated the umbilical vein during pregnancy i believe,and another somewhere near the heart .
check out link for hepatic setup
notes on pulmonary suggest its the only vein to carry oxygenated blood,if your not pregnant i guess.
2006-10-09 00:46:26 · answer #9 · answered by Anonymous · 0⤊ 0⤋
I only went as far as High School health courses, but it was my understanding at that level, that veins were the return path of deoxygenated blood in the circulatory system.
2006-10-05 11:02:31 · answer #10 · answered by Pundit Bandit 5 · 1⤊ 2⤋