Small Intestine Structure/Function

Small Intestine Structure/Function


This lesson will examine the structure of the small intestine and its role in digestion.

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  • Small Intestine

    A part of the digestive tract where the majority of nutrients are absorbed.

  • Villi

    Small finger-like projections that line the mucosa and act to increase surface area and absorb nutrients.

  • Microvilli

    Hair-like projections that cover villi and aid in absorption of nutrients.

  • Duodenum

    The first section of the small intestine.

  • Jejunum

    The middle section of the small intestine.

  • Ileum

    The last section of the small intestine which connects to the large intestine.

  • Peristalsis

    Wave-like muscle contractions that push contents through the small intestine.

  • Amylase

    An enzyme that breaks down carbohydrates in the digestive system.

  • Lipase

    An enzyme that breaks down fats in the digestive system.