What is true about the small intestine?

MP CHO -2019 (Shift-1)

Applied Anatomy

Easy

Appeared in: MP CHO -2019 (Shift-1)

Explanation

The small intestine is the principal site for the chemical digestion of food and absorption of nutrients.
Chyme entering the small intestine is mixed with bile and pancreatic and intestinal enzymes, which break down carbohydrates, proteins, and fats into absorbable molecules.
By the time the contents reach the large intestine, the digestive process is largely finished, and most nutrients have been absorbed.

Option A: This statement is anatomically incorrect. The duodenum is the first of the three segments of the small intestine, immediately following the stomach.
Option C: This statement misidentifies the order of the small intestine's segments. The ileum is the final and longest section, while the jejunum is the middle section.
Option D: This option is incorrect because two of the individual statements (A and C) are factually false.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy and physiology of the small intestine as background academic context rather than a clinical decision trigger.
Understanding the specific functions of each part of the small intestine is crucial for managing patients with gastrointestinal disorders or those who have undergone bowel surgery.
For example, a patient with a resected ileum is at high risk for Vitamin B12 deficiency (leading to pernicious anemia) and malabsorption of bile salts (leading to steatorrhea and diarrhea). Nurses must monitor for these complications and may need to administer Vitamin B12 injections.
What if? If a patient has celiac disease, the villi in the duodenum and jejunum become damaged. This would primarily impair the absorption of carbohydrates and proteins, leading to malnutrition, weight loss, and bloating, even if the ileum is healthy.

How to Approach the Question

First, identify the core subject of the question, which is the small intestine.
The question asks for a 'true' statement, so you must evaluate each option for factual accuracy.
Analyze Option A: 'Duodenum is not part of the small intestine.' Recall the basic anatomy. The small intestine consists of the duodenum, jejunum, and ileum. Therefore, this statement is false.
Analyze Option C: 'Ileum is the middle part of the small intestine.' Recall the order of the segments: Duodenum -> Jejunum -> Ileum. The ileum is the last part. Therefore, this statement is false.
Since options A and C are false, Option D ('All of the above') must also be false.
Analyze Option B: 'Digestion is almost complete.' Consider the primary function of the small intestine. It is the main site for breaking down food with enzymes and absorbing nutrients. This makes the statement highly plausible and the correct answer by elimination.

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