BTEC PE Homework Task
Antagonistic Muscles
You are going to make a model to show how the biceps and triceps muscles work to
bend and straighten the arm.
Apparatus
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•
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String
Scissors
Butterfly clip
1
2
3
Stick the worksheet onto fairly rigid card.
Cut out both shapes along the solid lines.
Using something sharp, like a pair of compasses, make holes at the positions
marked 1, 2 and P on both shapes.
Attach the pieces at point P using a paper fastener (butterfly clip). Check that the
pieces can move freely.
Cut 2 pieces of string at least 15 cm long.
Tie a knot in one end of each piece of string and thread through the holes as
shown on the diagram. The knots should be at the ‘elbow’ end of the model.
4
5
6
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Card
Glue
Something to make a hole with
Your final model should look like the one below.
1
2
3
4
Which muscle does string 1 represent?
Which muscle does string 2 represent?
What happens when you pull string 1?
What happens when you pull string 2?
A
B