What is the primary function of the jejunum in the digestive system?

• A. Absorption of nutrients
• B. Mechanical breakdown of food
• C. Storage of bile
• D. Production of digestive enzymes

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by identifying the jejunum as part of the small intestine, located between the duodenum and ileum. Its structure is specialized for its function in the digestive system.
2. Step 2: Understand the primary role of the small intestine, which is nutrient absorption. The jejunum, specifically, has a highly folded lining with villi and microvilli that increase surface area for absorption.
3. Step 3: Eliminate incorrect options by considering the anatomy and physiology of the digestive system. For example, 'Mechanical breakdown of food' primarily occurs in the mouth and stomach, not the jejunum.
4. Step 4: Similarly, 'Storage of bile' is a function of the gallbladder, and 'Production of digestive enzymes' is primarily associated with the pancreas and stomach, not the jejunum.
5. Step 5: Conclude that the primary function of the jejunum is the absorption of nutrients, as its structure and location are optimized for this purpose in the digestive process.