Lesson: Absorption and Defecation Biology • Second Year of Secondary School

In this lesson, we will learn how to describe how products of digestion are absorbed by the small intestine, outline how the small intestine is adapted to do this, and explain how food that cannot be digested is removed from the body by defecation.

Lesson Plan

Students will be able to

recall that digestion is the process of breaking down large molecules into smaller ones that can be absorbed and used by the body,
identify the small intestine from its location in the body or description of its function,
describe the structure of the villi and associated microvilli that line the small intestine,
explain how the products of digestion are transported into the blood and lymph,
recall that water absorption and defecation are functions of the large intestine,
describe the adaptations of the large intestine, rectum, and anus for defecation.