Science Arm Project
In science class we worked on a human arm. We built a model out of Toilet Paper Rolls, Balloons, Tape, Markers and a Paperclip. When we had finished building it, when you stretched it out it would contract and when you let it go in it would relax. The three biggest bones in the human arm are: the Humerus, the Ulna, and the Radius. The Humerus is the upper bone in the arm, it goes from the shoulder to the elbow. The Ulna and the Radius make up the bottom half of the arm, the elbow to the wrist. The Ulna is the inner one and the Radius is the outer bone. All together they make up most of the arm.
I thought that it would flex a little.
The first step was to label one of the paper towel rolls the Humerus. Then, you cut the one in half that is not labeled the humerus and roll both halves up, tape them, and label them the Radius and the Ulna. Then put a flattened paper clip and stick it through all three rolls. Next bend the ends of the paper clip to keep it in place. Next blow up two balloons and tape the sides to the roles. Then, you are done.
The model arm flexed much more than I thought it would flex. Overall, Success.