what is the advantage of the portal system (heart) ??

Dear student,

Hepatic portal system carries the blood from abdominal part of gastro-intestinal tract (excluding anus) to the liver thereby capturing substances from digestive system to the liver for metabolism. 
Advantages of the system are:
  • Blood received by liver from GI-tract contains nutrients as well as toxins.
  • Nutrients are absorbed for processing and for storage until required.
  • The toxins absorbed from blood by liver are sometimes harmful to the body as they may contain bacterial metabolites. Liver processes them to make less harmful.
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Hope this answer will help you clear your doubt.

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Regards

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