Students measure resting heart rate, compare it with heart rate after exercise, and relate the increase to cells' increased need for oxygen and energy. Students listen to heart sounds and relate the sounds to the function of the heart chambers. Students model the movement of blood by role-playing parts of the circulatory system. They relate circulation to the exchange of oxygen and carbon dioxide in the lungs and body tissues.

Student Resources

Learn by Reading

For additional content-area reading, check out the Houghton Mifflin Science eBook: Grade 5, Unit A, page 34.