Q.What is the significance of hepatic portal system in the circulatory system?

The hepatic portal system's significance lies in routing blood from the intestine to the liver first, via the hepatic portal vein, before that blood is allowed to join the general systemic circulation. This gives the liver first access to everything absorbed from the intestine, letting it process and regulate these substances before they reach the rest of the body. …

The hepatic portal system is a unique vascular connection between the digestive tract and the liver: the hepatic portal vein carries blood from the intestine directly to the liver, and only after passing through the liver is this blood passed on into the general systemic circulation. …

Method: Explaining the Functional Significance of a Special Vascular Route

Use this approach for "what is the significance of..." questions about a named vascular connection (as distinct from simply naming it).

Steps

Step 1: Establish the route first

State which vessel and which two organs are involved -- the hepatic portal vein, carrying blood from the intestine to the liver, before it joins general circulation.

Step 2: Ask "why route it there before anywhere else?"

The key to significance questions is identifying what privileged access this ordering creates -- here, the liver gets first exposure to everything just absorbed from digestion, before it is diluted into and distributed by the rest of the body's circulation.

Step 3: State what that privileged access allows the organ to do …