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.
The Liver
Absorbed nutrients from the intestines travel to the liver via the hepatic portal vein. This vein carries blood rich in nutrients from the intestines directly to the liver for processing and storage. Once in the liver, the nutrients are metabolized and distributed to the rest of the body as needed.
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.
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.
Process the nutrients absorbed by the small intestine.
In the liver, nutrients are processed and absorbed into the bloodstream. They can then be transported to cells throughout the body to provide energy, support growth, and maintain overall health. Any excess nutrients that are not immediately needed are stored in the liver or other tissues for future use.
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.
After food is digested in the intestines, nutrients are absorbed into the bloodstream. The liver receives these nutrients from the blood supply and distributes them to the cells through specialized transport systems. The liver cells then utilize these nutrients for energy, growth, and other metabolic functions.
Its main function within the digestive system is to process the nutrients absorbed from the small intestine.
Alcohol primarily targets the liver first after it is absorbed into the blood.