For this lesson, students are required to work in teams to simulate the volume of blood moving through the circulatory system by transferring blliquid into-and through-a series of containers.

This site from the Department of Chemistry at the Washington University provides a deetailed study of the role of hemoglobin in blood physiology. The article is somewhat in-depth, complete with pictures, charts, and a bibliography.

A very good site about the circulatory system of a bird. It is reader friendly, and includes a fair amount of information. Good diagram of the circulatory system.

This thorough resource provides listing of ten unique characteristics peculiar to the cardiovascular system along with an examination of these ten factors individually.

This resource from Khan Academy provides information about hypertension, a circulatory system disease. Students will learn the basic facts about this disease.

Causes of heart failure, signs and characteristics of heart failure, pathologic conditions resulting in heart failure, and more are the topics addressed in this thorough resource.