Module 4 Topic 3
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5 Terms
How long is the small intestine?
The small intestine is about 3 meters long in a living person and 6.5 meters in a cadaver.
What are the three regions of the small intestine?
A: The three regions are:
Duodenum – the shortest section.
Jejunum – the middle section.
Ileum – the longest section.
What structural features of the small intestine enhance digestion and absorption?
The small intestine has circular folds, villi, and microvilli, which increase surface area for digestion and absorption.
What are villi and their role in digestion?
Villi are fingerlike projections that increase the surface area for absorption. Each villus contains capillaries and a lacteal to transport nutrients.
How is the small intestine histologically structured?
The small intestine has four main layers: