Is the hepatic portal system a second capillary system?
In the second system, the hepatic portal circulation, capillaries originating in the gastrointestinal tract and the spleen merge to form the portal vein, which enters the liver and divides to form portal capillaries.
Does the liver have a portal capillary system?
The hepatic portal system is a series of veins that carry blood from the capillaries of the stomach, intestine, spleen, and pancreas to capillaries in the liver. It is part of the body’s filtration system.
Does hepatic portal vein start and end with capillaries?
The blood leaves the liver to the heart in the hepatic veins. The portal vein is not a true vein, because it conducts blood to capillary beds in the liver and not directly to the heart….
Portal vein | |
---|---|
System | Hepatic portal system |
Drains from | Gastrointestinal tract, spleen, pancreas |
How does the hepatic portal system work?
The hepatic portal system is the venous system that returns blood from the digestive tract and spleen to the liver (where raw nutrients in blood are processed before the blood returns to the heart).
What are the major vessels in the hepatic portal system?
The superior mesenteric vein and the splenic vein come together to form the actual hepatic portal vein. The inferior mesenteric vein connects in the majority of people on the splenic vein, but in some people, it is known to connect on the portal vein or the superior mesenteric vein.
What is the difference between hepatic and portal veins?
Each hepatic vein can have two or more branches inside the liver. One is the hepatic artery, which brings in oxygen-rich blood from the heart. The other is the portal vein, which delivers blood from your stomach, intestines, and the rest of your digestive system.
What is the purpose of hepatic portal system?
What is portal vein in liver?
The portal vein is a blood vessel that delivers blood to the liver from the stomach, intestines, spleen, and pancreas. Most of the liver’s blood supply is delivered by the portal vein.
Is the hepatic portal circulation a capillary circulation?
yes, the hepatic portal circulation drains into the liver sinusoids, which is one large capillary circulation. The hepatic arteries and portal vein give off branches that make up the portal triad which delivers blood (both arterial and venous blood) to the functional units of the liver which are the hepatic lobules.
Where does the hepatic portal system drain into the liver?
The hepatic portal system drains into the liver and forms a highly fenestrated network of capillary beds within the liver parenchyma. In the case of the hepatic portal circulation, the flow through the liver sinusoids is considered this capillary bed.
Why does the liver have a second capillary bed?
A Second Capillary Bed as a Safety System. The liver must filter the blood from the spleen as well, since it is well known that red blood cells are degraded here. Their constituents accumulate in the blood and must be completely disassembled and recycled in the liver.
Where are the Stars in the hepatic portal system?
The stars indicate the continuity between the hepatic portal system and the liver. The gastric vein accompanies the gastric artery onto the dorsal and ventral surfaces of the stomach. Follow the lienomesenteric vein as it extends along the dorsal lobe of the pancreas.