Students will work with a lab partner for this activity.
Have one student in each group build a model of a partially clogged blood vessel by filling the sides of the toilet paper tube with clay and leaving a hole for "blood: to flow through.
Have the other students in each group completey clog the blood vessel by filling the tube completely
Model the flow of blood through the different blood vessels by blowing air through each.
Students should place a hand over the open end of the tube as the instructor operates the hairdryer and hold the tube in place for each model. Place the hairdryer (without diffuser) directly against the tube so that all of the air flows through the tube.
Begin with the completely open vessel. Say "This models the flow of blood through a completely unclogged artery. We will next compare with a vessel that is partially blocked."
Model the partially clogged vessel. Discuss - Ask " How does the blood "air" flowing through this vessel differ? Students should indicate that less blood flows through a partially clogged vessel
Model the completely clogged vessel. Ask "How much blood "air" is flowing?" Students should be able to ascertain that NO blood is flowing through this vessel.
For Discussion after the activity:
Discuss the negative health affects of this situation including less oxygen reaching the heart, brain, and other organs and the possibility of a heart attach or stroke.
Discuss the flow (or lack of flow) of "blood" thorugh the 3 vessels and the increase in blood pressure as the "blood" flows through the partially clogged vessel
Discuss heart disease prevention including
a. Avoiding smoking
b. Eating less fatty foods which can cause blood vessels to be clogged.
c. Engaging in regular exercise to strengthen your heart and circulatory system.
Discuss the importance of annual check-ups with a physician and checking cholesterol regularly.