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Circulation and Respiration
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Circulation
Getting Oxygen and Nutrients to your Body
Grades 6-9

By measuring their own heart rates and examining actual heart specimens, students explore the
components of the cardiovascular system (heart, lungs, veins, arteries, capillaries, and blood)
and learn to see them as interconnected elements of a single dynamic system. Students apply the
scientific method by analyzing the effect of a factor (height, gender, physical activity, or
emotions) on the resting heart rates of the class members. Students also determine the
hematocrit of blood samples reinforcing the role of the red blood cell in supplying oxygen
to cells.

Respiration
Providing Oxygen for your Body
Grades 6-9

By constructing a functioning model lung, determining their own lung volume, and examining actual
lung specimens, students will become familiar with the basic structure and function of the respiratory
system. Students apply the scientific method by analyzing the effect of a factor (height, gender,
physical activity, or exposure to smoke) on the lung volume of the class members. Students
explore the relationship between volume and surface area and how this concept effects the
structure and function of the lung.

Circulation, Respiration, and Smoking
The Story of Four Chemicals in Smoke
Grades 6-9

The basics of circulation and respiration are reviewed with emphasis on their important roles
in the process of cellular respiration, the essential process by which cells obtain energy.
Four chemicals found in smoke are introduced and the effects of carbon monoxide and cyanide on
cellular respiration are emphasized. Students take on the role of red cells in blood and compare
their trips around the body in a healthy versus smokers body.


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