After food is propelled to the stomach by the oesophagus, it is then sent to ______ where physical digestion via segmentation takes place.

Appeared in: UP CHO - 10 September 2021

Explanation

After leaving the stomach, the partially digested food, known as chyme, enters the small intestine.
The small intestine is the primary site for both chemical digestion and the absorption of nutrients.
Segmentation is the main type of mechanical digestion in the small intestine. It involves localized contractions that mix the chyme with digestive juices and bring it into contact with the intestinal wall for absorption.
This mixing movement is distinct from peristalsis, which is a wave-like contraction that propels food forward through the digestive tract.

Option A: The anus is the terminal end of the GI tract, responsible for the elimination of feces from the body. No digestion or absorption occurs here.
Option B: The liver is an accessory digestive organ. It produces bile, which is essential for fat digestion, but food does not pass through the liver itself.
Option C: The large intestine is located after the small intestine. Its primary functions are water absorption and formation of feces. Its characteristic motility is haustral churning, not segmentation for digestion.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Gastrointestinal motility and digestive pathway as background academic context rather than a clinical decision trigger.
Understanding normal GI motility is fundamental for nurses to identify abnormalities such as paralytic ileus (absence of motility) or bowel obstruction.
A key nursing assessment is auscultating for bowel sounds in all four abdominal quadrants. The presence, frequency, and character of these sounds (e.g., normoactive, hyperactive, hypoactive) indicate the state of intestinal motility.
What if? If a patient develops a small bowel obstruction, the segmentation and peristalsis above the blockage may initially become hyperactive, causing high-pitched, 'tinkling' bowel sounds. As the condition progresses, the bowel may fatigue, leading to hypoactive or absent sounds, which is a medical emergency.

How to Approach the Question

First, identify the key elements of the question: the starting point (after the stomach) and the specific process (segmentation).
Recall the anatomical pathway of the gastrointestinal (GI) tract in order: Mouth → Esophagus → Stomach → Small Intestine → Large Intestine → Rectum → Anus.
Based on this pathway, the organ immediately following the stomach is the small intestine.
Next, recall the primary type of motility for each major digestive organ. Segmentation is the characteristic mixing movement of the small intestine.
Confirm your choice by eliminating the other options based on their functions: the anus is for elimination, the liver is an accessory organ, and the large intestine primarily absorbs water using haustral churning.
This two-step process of tracing the path and recalling the function confirms the small intestine as the correct answer.

Concept Tested & Keywords

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E6 Nursing Brunner Adult Health 3SA Vol 1 Part 2 p. 71-73

Practise the full UP CHO - 10 September 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.