A prudent nurse knows that most nutrients are absorbed in?

AIIMS Delhi NO - 2017

Applied Physiology

Easy

Appeared in: AIIMS Delhi NO - 2017

Explanation

The small intestine is the principal site for the digestion and absorption of about 90% of nutrients from ingested food.
Its internal wall is lined with millions of finger-like projections called villi, which are further covered in microscopic projections called microvilli. This structure vastly increases the surface area for absorption.
Essential nutrients, including carbohydrates (as monosaccharides), proteins (as amino acids), fats (as fatty acids and glycerol), vitamins, and minerals, are absorbed into the bloodstream or lymphatic system through the walls of the small intestine.

Option A: The large intestine's primary function is the absorption of water and electrolytes from indigestible food matter, not the absorption of most nutrients.
Option C: The esophagus is a muscular tube that serves as a conduit, transporting food from the pharynx to the stomach. No significant digestion or absorption occurs here.
Option D: The rectum is the terminal section of the large intestine. Its main function is the temporary storage of feces before they are eliminated from the body. Only very limited absorption (e.g., some water, electrolytes, and certain drugs administered as suppositories) occurs here.

Clinical Relevance

Nursing practice connection: Knowing Physiology of nutrient absorption in the gastrointestinal tract helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding that the small intestine is the primary site for nutrient absorption is critical for assessing and managing patients with gastrointestinal disorders like celiac disease, Crohn's disease, or short bowel syndrome, which can lead to severe malnutrition.
Nurses must monitor patients with small bowel disease for signs of malabsorption, such as weight loss, chronic diarrhea, steatorrhea (fatty stools), and specific nutrient deficiencies.
What if? If a patient has had a significant portion of their jejunum (the middle part of the small intestine) surgically removed, the nurse would anticipate malabsorption of carbohydrates, fats, and proteins, likely requiring specialized nutritional support like total parenteral nutrition (TPN) or specific dietary modifications.

How to Approach the Question

First, identify the keywords in the question: 'most nutrients' and 'absorbed'.
This is a factual recall question testing your knowledge of the primary functions of the different organs within the gastrointestinal (GI) system.
Mentally review the main role of each option: Esophagus (transport), Stomach (digestion), Small Intestine (digestion and absorption), Large Intestine (water absorption), Rectum (storage).
Correlate the concept of absorbing 'most nutrients' with the organ specifically designed for this purpose. The small intestine's vast surface area (due to villi and microvilli) makes it the principal site.
Eliminate the other options based on their primary functions, which are not nutrient absorption.
Select the option that correctly identifies the small intestine as the primary site of nutrient absorption.

Concept Tested & Keywords

Concept Tested: Physiology of nutrient absorption in the gastrointestinal tract.
Stem keywords: nutrients, absorbed, most
Lead-in keywords: most

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