This organ is the primary site for nutrient absorption.

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The question asks to identify the organ that serves as the primary site for nutrient absorption.
Option 1: liver. While the liver processes nutrients, detoxifies substances, and metabolizes various compounds, it is not where most nutrients are absorbed from the digestive tract. Absorption occurs earlier along the tract, and the liver primarily receives nutrients via the portal vein after absorption.
Option 2: small intestine. This is the key site where most nutrients are absorbed from digested food. The lining contains villi and microvilli to maximize surface area, enabling efficient uptake of amino acids, sugars, fats, vitamins, and minerals into the bloodstream or lymphatic system.
Option 3: heart. The heart's function is to pump blood; it does not participate in the absorption of nutrients from the gut. Any nutrients present in the blood are transported by the circulatory system after intestinal absorption, not absorbed in the heart itself.
Option 4: stomach. The stomach primarily digests proteins with acid and enzymes and begins some limited absorption (such as alcohol and certain drugs), but it is not the major site for nutrient absorption. Most nutrients are absorbed further along in the small intestine, after chyme passes from the stomach.

fshn_120_120251_244864 CHAPTER 4 DEFINITION INQUISITION (DI) - 3 TAKES - HIGHEST SCORE COUNTS

This organ is the primary site for nutrient absorption.

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