Which of the following best describes absorption in the digestive process?

Question

BlackTom AI · Accepted Answer

Prompt asks about where absorption occurs in the digestive process and which best describes the pattern across the GI tract.
Option 1: 'The stomach, small intestine, and large intestine all absorb nutrients equally' is incorrect because absorption is not equal across segments. The small intestine is the primary site, while the stomach and large intestine contribute far less to overall nutrient absorption.
Option 2: 'Some absorption occurs in the stomach and in the small intestine, but most absorption occurs in the large intestine' is incorrect since the large intestine mainly absorbs water and electrolytes, not most nutrients. Most nutrient absorption actually happens earlier, primarily in the small intestine.
Option 3: 'Some absorption occurs in the stomach and in the large intestine, but most absorption occurs in the small intestine' correctly reflects physiology: the stomach and large intestine contribute to absorption of certain substances (e.g., some water, alcohol, drugs; and water/electrolytes in the large intestine), but the majority of nutrient absorption occurs in the small intestine due to its long length, villi, and microvilli increasing surface area.
Option 4: 'Some absorption occurs in the small intestine and large intestine, but most absorption occurs in the stomach' is inaccurate because the stomach is not the main site of nutrient absorption; its role is mainly in mechanical and chemical breakdown and limited absorption (e.g., some drugs, alcohol), not the majority of nutrients.
In summary, the correct concept is that absorption is distributed with limited activity in the stomach and large intestine, while the small intestine handles the bulk of nutrient uptake.

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Which of the following best describes absorption in the digestive process?

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