How to Build a Stomach Model
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Whether it is for an anatomy class, a science fair or another classroom activity, making a model of a stomach is a quick project that will result in a paintable model. When you have made your stomach, you can add the muscles or any other detail you desire using acrylic paints. These instructions will help you make a fairly durable, lightweight model stomach that will be practical for transporting to your school.
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Decide on the size of the model you wish to create. If you plan to make a model approximating life size, you will need to inflate a round balloon.
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Form the model magic around the balloon (or into a ball if you are not using a balloon). The model magic needs to have a support in the center if it is to dry correctly when making large models. This is what the balloon is for.
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Pull (or add another piece of model magic) to create the oblong shape that is standard for a stomach. Depending on which animal's stomach you are modeling, you may have to add quite a lot more model magic. Look at your picture or diagram to figure out what shape you need to make.
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Roll more model magic into thick cylinders and cut them to size with a butter knife to create the tubes leading to and from the stomach.
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Attach the tubes from Step 4 to the correct sides of your model stomach. Smooth the seams with your fingers.
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Allow the finished project to dry for several days before painting, if desired.