Because the hepatic portal vein carried blood directly from the small intestine to the liver before going to the heart. Meaning the liver gets all the nutrients in it directly.
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The Liver
During digestion, the absorbed nutrients travel to the liver via a special type of vein. The vein is called the hepatic portal vein.
via the hepatatic portal system (all absorbed nutrients except triglicerides)or via the lymphatic vessels to the blood vascular system and then to the liver (triglicerides)
The liver is the first organ to receive nutrients that are absorbed from the GI tract. It is the 'gatekeeper' and is responsible for filtering out possible toxins before they reach delicate tissues such as the brain. The hepatic vein takes blood from the liver to the heart.
Process the nutrients absorbed by the small intestine.
The liver receives the bulk of the water soluble nutrients.Little absorption occurs in the oral cavity, esophagus, and stomach. The small and large intestines are where most absorption takes place. The blood flows from the intestines back to the liver via the portal vein.
The hepatic portal vein carries blood (and absorbed nutrients) from the small intestine to the liver.
All nutrients we have taken are absorbed into the blood in the small intestine. The excess are stored in the liver from where if required is again absorbed into the blood.
Its main function within the digestive system is to process the nutrients absorbed from the small intestine.
Nutrients are absorbed by small intestine. They are presented to the liver for processing. Then they are sent to the rest of the body via blood.
Nutrients are absorbed throughout the digestive process. Specific nutrients are absorbed in the stomach and large intestines, but the majority of nutrients are absorbed in the small intestines.
Enzymes, Glucose and The Protein work together to enter the body then go through the small intestine and rubbing onto the villi