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Unit 19: Biology Part 2 Page 97 of 137

3. Your finger becomes so clean, you can see the small capillaries where
oxygen transfer is happening.

Experiment: Modeling Blood Pressure

Materials:

 Oblong balloon
 Syringe

1. Fill an oblong balloon with water
2. Cover the tip of a syringe with the open end of the balloon
3. Using the syringe, remove and replace water to simulate the

expansion and contraction of blood vessels
4. Which situation represents systolic blood pressure? How about
diastolic?

Experiment: Clogged Arteries

Materials:

 Plastic container
 2/3 cup water

 2 straws
 Bean sized lump of clay
 Paperclip

1. Fill a plastic container 2/3 full of water.
2. Insert a clean straw about halfway down the container's length
measured from the bottom of the vessel to its top.
3. Blow into the straw with a steady air stream that produces about a
continual stream of bubbles. Describe the blowing effort needed to
produce this steady, but non-violent stream of bubbles.
4. Completely pack the end of a second straw with a bean-sized lump of
clay.
5. Unbend a paperclip and use it to poke a small hole through the clay
plug.
6. Insert this straw to the same depth as in step 2. Again, blow a steady
air stream into the straw. How does the effort compare to when the

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