How were your pretend muscles similar to real muscles? Different?
What changes occur to the real muscles in the human body to make them pull on bones?
What would happen if the ligaments of the models were overstretched or torn? How would it affect the way the models could operate?
The model that we made needed three bones to make it work. These bones were the humerus, ulna, and radius. The elbow joint was located between the humerus and the ulna and radius. The model needed two muscles which were the bicep and tricep. Our muscles were similar to real muscles because the bicep pulled the radius and ulna up to the humerus. The tricep pulled the radius and ulna back down away from the humerus. The muscles were different because in order to get the muscles to pull the radius and ulna up or to pull them back down we needed to have the string attach to the opposite ends of the arm. In the real muscles the location is different and they are attached to tendons that make the action work. Muscles in the human body work by extending and contracting to pull the tendons or release to allow other muscles to work. It is a relaxation and tension that make them work. If the ligaments of the model were overstretched or torn the arm and joint would have more trouble working. The muscle would hurt and not work properly. It would affect the model by decreasing the movement of the arm.