What major vessel carries blood from the digestive organs to the liver?

The major vessel that carries blood from the digestive organs to the liver is indeed the portal vein. This vessel plays a crucial role in the body's circulatory system by transporting nutrient-rich blood from the intestines, pancreas, spleen, and stomach directly to the liver.

The liver is significant because it processes the nutrients absorbed from the digestive tract before the blood is distributed throughout the rest of the body. This allows the liver to metabolize substances, produce proteins, and regulate glucose levels, amongst other functions.

The aorta, while a major vessel, is responsible for carrying oxygen-rich blood from the heart to all parts of the body and does not specifically transport blood from the digestive organs to the liver. The pulmonary artery carries deoxygenated blood from the heart to the lungs for oxygenation, which is unrelated to the digestive system. The femoral vein transports deoxygenated blood from the lower limbs back to the heart and does not contribute to the hepatic portal circulation. Thus, the portal vein is essential for linking the digestive system with the liver.