Question

Q a) a spreadsheet of the flow to the brain from the liver and from the brain to the liver - every step how the blood flows in detail.

a) Blood flow from brain to liver

b) blood flow from liver to brain

c)How do vertebral arteries connect brain and the liver? (special emphasis on the blood flow between liver and brain)

(I want full detail of it with diagram , flow sheets and full explanation. I have asked this question 2 times before but got lame answers everytime)

Answer 1

The liver is acomplex biochemoical processing plant. It packages nutrients absorbed by the digestive system, produces plasma proteins,cloting factors and bile and diposes of wornout cellcomponents amd waste products.

Instead og enrtering the circulation directly,absorbed nutrients and certain wastes travel to te liver for processing.They do so via HEPATIC PIRTAL SYSTEM.

The liver receives blood from the normal systematic circulation viathe hepatic artery. It also receives and processess blood from other organs delivered via the veins of the hepatic portal system. All blood exists the liver via the hepatic vein, which delivers the blood to the inferior vena cava.Portal system begin and end in capillaries. Here initial capillary is from the stomach ,small intestine large intestine and spleen lead to the hepatic portal vein and end in specialized capillaries with the liver. the hepatic sinusoids.

The hepatic portal system consists of the hepatic portal vein and the veins that drain into it. The hepatic portal vein itself is relatively short, beginning at the level of L2 with the confluence of the superior mesenteric and splenic veins. It also receives branches from the inferior mesenteric vein, plus the splenic veins and all their tributaries. The superior mesenteric vein receives blood from the small intestine, two-thirds of the large intestine, and the stomach. The inferior mesenteric vein drains the distal third of the large intestine, including the descending colon, the sigmoid colon, and the rectum. The splenic vein is formed from branches from the spleen, pancreas, and portions of the stomach, and the inferior mesenteric vein. After its formation, the hepatic portal vein also receives branches from the gastric veins of the stomach and cystic veins from the gall bladder. The hepatic portal vein delivers materials from these digestive and circulatory organs directly to the liver for processing.

Because of the hepatic portal system, the liver receives its blood supply from two different sources: from normal systemic circulation via the hepatic artery and from the hepatic portal vein. The liver processes the blood from the portal system to remove certain wastes and excess nutrients, which are stored for later use. This processed blood, as well as the systemic blood that came from the hepatic artery, exits the liver via the right, left, and middle hepatic veins, and flows into the inferior vena cava. Overall systemic blood composition remains relatively stable, since the liver is able to metabolize the absorbed digestive components.