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Lesson Plan: Absorption and Defecation Biology • Second Year of Secondary School
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students 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.
Objectives
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.
Prerequisites
Students should already be familiar with
- the major organs of the human body,
- blood as a transport fluid.
Exclusions
Students will not cover
- details of the process of diffusion and active transport,
- details of metabolism.
