The main function of most of the small intestine (jejunum and ileum) is:

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BlackTom AI · Accepted Answer

The question asks about the main function of the majority of the small intestine, specifically the jejunum and ileum.
Option 1: 'Filter and produce urine' — This describes renal function, not intestinal function. The kidneys filter blood to produce urine, which is unrelated to nutrient processing in the small intestine.
Option 2: 'Defecation /Excretion' — Defecation refers to eliminating solid waste from the digestive tract, a process that occurs primarily in the large intestine and rectum, not the primary role of the jejunum and ileum.
Option 3: 'Nutrient Absorption (Chemical Digestion)' — The jejunum and ileum are specialized for absorbing nutrients that result from chemical digestion; the intestinal lining with villi and microvilli increases surface area to maximize absorption of amino acids, fatty acids, sugars, vitamins, and minerals. While some digestion occurs via brush-border enzymes, the dominant function is absorption.
Option 4: 'Physical breakdown of food (mechanical digestion)' — Mechanical digestion such as grinding and mixing mainly occurs via chewing in the mouth and peristaltic movements throughout the GI tract, but the major mechanical processing in the small intestine is not its primary role; the surface area and absorptive functions are more central here.
Overall, the statement that best captures the principal role of the jejunum and ileum is focused on nutrient absorption following chemical digestion, with these segments specialized for uptake rather than filtration, excretion, or primary mechanical processing.

2261 REHSCI 1200 SEC1010 Graded Quiz 6

The main function of most of the small intestine (jejunum and ileum) is:

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