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The hepatic portal vein is the blood vessel responsible for collecting blood from the digestive organs. This vein is a crucial component of the portal circulation, which directs blood from the gastrointestinal tract and spleen to the liver. When blood is collected from the digestive organs, it is rich in nutrients absorbed from food, and this is important for the liver’s functions, such as detoxification, metabolism, and the regulation of blood sugar levels.

In contrast, the inferior vena cava carries deoxygenated blood from the lower body back to the heart but does not specifically collect blood from the digestive system. The aorta is the main artery that carries oxygenated blood from the heart to the rest of the body, including the digestive organs, but it does not serve the function of collecting blood from them. The pulmonary artery carries deoxygenated blood from the heart to the lungs for gas exchange and is not involved in the collection of blood from the digestive organs.

Thus, the hepatic portal vein is specifically designed for transporting blood that has passed through the digestive system, making it the correct choice in this context.