Certified Neuroscience Registered Nurse (CNRN) Practice Exam

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Prepare for the CNRN Exam. Test your knowledge with our comprehensive multiple-choice questions and detailed explanations. Boost your confidence and improve your chances of a successful exam outcome!

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What makes up the first two-fifths of the small intestine?

Duodenum
Jejunum
Ileum
Colon

The correct answer is: Jejunum

The first two-fifths of the small intestine is made up of the jejunum. This segment follows the duodenum and is significant for nutrient absorption. The jejunum is characterized by a thicker wall, a more extensive vascular supply, and greater surface area due to its many folds and villi, making it crucial in the digestive process. The duodenum, while essential as the first part of the small intestine that connects to the stomach, only represents the first fifth. The ileum makes up the final section of the small intestine, contributing the remaining three-fifths. The colon, on the other hand, is part of the large intestine and is not involved in the composition of the small intestine.