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Arm

Key-materials Elbow joint: Ball Other part: Foam Barbecue sticks (many) Cardboard? Biceps contract/relax Yarn. Arm. Other part. Other part. Elbow joint. Materials : Craft sticks (2 per model) Rubber bands (2 large and 2 small per model)

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Arm

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  1. Key-materials • Elbow joint: • Ball • Other part: • Foam • Barbecue sticks (many) • Cardboard? • Biceps contract/relax • Yarn Arm Other part Other part Elbow joint

  2. Materials: • Craft sticks (2 per model) • Rubber bands (2 large and 2 small per model) • Scissors or other tools to cut notches in craft sticks Directions: • Wrap the two small rubber bands around the craft sticks to secure the bones at the elbow joint but allow the joint to move. • Cut two small notches in each craft stick to represent the origin and insertion of each muscle. Using rubber bands to represent muscles, attach two muscles, the biceps and triceps, to your model arm. • Make sure your model works. That is, when you pull on a muscle (contract it), the arm moves in the way the real arm would. • Label the parts of your model. • http://www.pbs.org/safarchive/4_class/45_pguides/pguide_1002/44102_builders.html

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