Click on this link and find two animated graphics of the pumping human heart. The path of blood-flow is listed in steps. The connection to the "teacher lesson plan information" does not work, but there are other links to superb resources...

Here is an interesting and engaging lesson on the lungs and the respiratory system. In it, fourth graders should gain a better understanding of how the lungs work and the role they play in supporting life. Some good, in-class partner...