Which of the following is most likely to be involved in portal circulation?

Question

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The portal circulation is the system of veins that carries blood from the digestive organs to the liver. Nutrients absorbed from the digestive tract, such as glucose, galactose, and fructose, are transported via the portal vein to the liver, where they are metabolized or stored. Glycogen, galactase, fructase, and starches are not directly involved in portal circulation; instead, they are substances that are either stored in the liver (glycogen), enzymes that break down sugars (galactase, fructase), or dietary carbohydrates that are broken down into simpler sugars before absorption (starches).

Which of the Following Is Most Likely to Be Involved