Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The duodenum is the first section of the small intestine, immediately following the stomach. It plays a crucial role in digestion and nutrient absorption.
5 Must Know Facts For Your Next Test
The duodenum receives partially digested food from the stomach and digestive enzymes from the pancreas.
It neutralizes stomach acid through secretions from Brunner's glands.
The duodenum is home to a specific microbiota that aids in digestion and protects against pathogens.
Bile from the liver and gallbladder enters the duodenum to emulsify fats.
The pH level in the duodenum rises to about 6-7 due to bicarbonate ions.