Site author Richard Steane
The BioTopics website gives access to interactive resource material, developed to support the learning and teaching of Biology at a variety of levels.

Construction of a model arm

Cut the card as shown in the diagrams below, then fold and punch out holes as indicated.
Fold one card in half. Cut out the shape of an arm from this, and punch a hole.

card version of lower arm
Make 2 L-shaped cuts in the other card. Fold in either side of centre section (3 thicknesses), then shorten this, round the edges, and punch a hole in the end of the centre section. Fold each side section into a V shape, standing up from the rest.

card version of upper arm

Use rolled up offcuts of card, sections of drinking straw, or split pins and staples to fix the two sections together.

assembled arm

One piece represents the forearm and hand, and the other represents the upper arm and shoulder blade, together with the main muscles which move the arm - the biceps and the triceps.
To make the arm bend, pinch in one of the "muscle" sections to make them shorten.

pinch one part then the other

Of course, your own arm is somewhat better than this!
In the space below, list as many ways as possible in which your (whole) arm is more advanced than this model.
   > wrist rotates

   > arm rotates at shoulder

   > fingers move

    etc etc!

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