Which of the following best describes the primary function of the small intestine?

Question

BlackTom AI · Accepted Answer

Let’s break down what each option claims about the small intestine’s role and weigh them against standard physiology.
Option a: 'Storage and compaction of feces' is a function of the large intestine, not the small intestine. The colon absorbs water and electrolytes and forms feces, so this statement misattributes that role to the small intestine.
Option b: 'Absorption of water and electrolytes' is primarily a job of the large intestine as well as a supportive function of the small intestine. While the small intestine does absorb some water and electrolytes, its main job is not best described by this phrase; the emphasis here omits the crucial nutrient absorption that the small intestine specializes in.
Option c: 'Absorption of nutrients from digested food' accurately captures the primary purpose of the small intestine. Its mucosa, villi, and microvilli maximize nutrient uptake following digestion, making this the central function for most nutrients.
Option d: 'Production of digestive enzymes and hormones' is characteristic of the pancreas (enzymes) and certain enteroendocrine cells, but the small intestine itself is not the main producer of digestive enzymes; it mainly secretes some luminal enzymes and relies on pancreatic enzymes for digestion. The hormonal regulation involves gut hormones, but the wording overstates a primary enzymatic production role for the small intestine.
In summary, options a and b misidentify the primary site of those functions, option d conflates the small intestine with enzyme production rather than focusing on its absorption role, and option c correctly identifies the core function of nutrient absorption in the small intestine.

BIO 181 (001&002) FALL 2025 4E - Self-Check: Human Digestive System: Intestines (LO 4E.1, 4E.2, 4E.3, 4E.4, 4E.5)

Which of the following best describes the primary function of the small intestine?

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