Editing Blood Clotting (section)

== Demonstration ==

Preparation: Blow up all the red balloons and place them inside the box. Be sure that you can still get the lid on with the balloons inside the box, and place the cutout over the membrane. Make sure to plug in the blower.
# Show the box, and ask for one or two students to be volunteers for this demonstration. Explain that the box represents the skin, and remove the lid to indicate a cut. Use the blower to blow the balloons out, and have the volunteers collect them.
# Now place the paper sheets across the balloons in the box. Show that this is a temporary barrier by using the blower to blow the balloons out again. Have the volunteers collect the balloons again.
# Finally, place the paper sheets across and then put the membrane lid on top. show that this holds the balloons inside the box, and finish by showing that this will allow the skin to reform by putting the cutout back on top.