Preparing to Use the Circulatory System Model Assembly Mixing of Solutions Manipulation

Assembly 1. Assemble the parts of the model as shown.

2. The “lungs” goes to the rear right square hole.

3.The “body” goes to the rear left square hole.

4. Put the “right” and “left ventricles”w/ “atria” in the rectangular hole in front of the “body” and the “lungs.” *As you face the model, the right ventricle and atrium will be on the left while the left ventricle and atrium will be on the right---just as they would be in a person facing you.

end of the “artery” going into the “lungs.” The “vein” leaving the “lungs,” color-coded red, is connected to the left atrium. 5. Then, connect the “blood tubes” as shown. The green or blue rubber stopper-syringe and tube covers the “right ventricle” with the other

6. Do the same with the red color-coded rubber stopper- syringe. It should cover the “left ventricle” with the “artery” going into the “body,” and the “vein” going into the “right atrium.

7. When completely assembled, the circulatory system model should look like this: *You are now ready to mix the solutions that will represent “blood rich in oxygen” and “blood poor in oxygen.”

Mixing of Solutions 1. In a clear glass jar, dissolve half of 1/8 teaspoon of phenolphthalein powder in 70% ethyl alcohol. Set aside.

2. In another clear glass jar, dissolve 1/8 teaspoon apog in water until the mixture is clear.

3. Using a funnel, pour both mixtures into a 1.5 L clear plastic bottle. The resulting liquid suddenly turns dark pink or red.

4. Add water up to the neck. This will be the “oxygen-rich blood.” You may now pour this into the “lungs,” “left ventricle,” and “left atrium” of the model.

5. Fill the “body,” “right ventricle,” and “right atrium” with water.

1. Make sure all stoppers and covers are firmly in place. The circulatory system model is now ready for use. Manipulation

2. Press the “right” and “left ventricles” rhythmically with your thumbs while your other fingers hold the bottles. Watch the solutions fill the tubes. *Add vinegar to the “body” when it starts to turn pink.