Begin with Activity 1-1: Pathway of Blood through Your Body.
Discuss the role of models in science.
Draw students' attention to the key ideas using means such as posters and overhead transparencies.
Complete Activity 1-2: Composition of Blood to help students visualize the components of human blood.
Assign Mini Activities: Artificial Blood and Blood Impressions.
Discuss the importance of blood in maintaining homeostasis and the effects of blood diseases on homeostasis.
Review the Apply Your Knowledge and the Review Questions.
Throughout and at the end of each section refocus students' attention to the key ideas.
What makes a delivery system efficient? Imagine you are in charge of a package delivery service. What things might make your job harder? What things might make your job easier? What would be the most important parts of a successful delivery company? Write a paragraph to explain your ideas, and include any lists, diagrams, or drawings you come up with.