Approximately what percentage of the horse's digestive tract is comprised of the stomach?

Question

BlackTom AI · Accepted Answer

In this question, we’re asked to estimate how much of the horse’s digestive tract is made up by the stomach.
Option 30%: This is too high. The horse has a relatively small stomach compared with its total digestive tract; the stomach does not account for nearly a third of the GI tract, since most digestion and absorption happens later in the intestines. A 30% share would imply a much larger stomach than horses actually have.
Option 20%: Still too large. While the stomach is a functional and essential organ, it does not comprise a fifth of the entire digestive tract. The majority of the horse’s digestive work—fermentation and nutrient absorption—occurs in the intestines, which reduces the stomach’s share well below 20%.
Option 10%: This aligns with typical anatomical and physiological data for horses, where the stomach is relatively small in proportion to the entire GI tract. The stomach’s volume is limited, and the majority of digestion and microbial fermentation takes place downstream, making ~10% a plausible estimate.
Option 5%: This is too small. Although the stomach is modest in size, a 5% share would undervalue its role and contradict standard anatomical proportions, since the stomach still constitutes more than a negligible fraction of the digestive system.

ANSC20002_2025_SM2 Week 6 quiz

Approximately what percentage of the horse's digestive tract is comprised of the stomach?

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