Cambridge Secondary (7-9). Stage 8. Science. Learner's Book - Unit 7: Diet and growth - Question 66

Question 6: Which position – 1, 2, 3 or 4 – matches the position where the real biceps is attached to the real radius?

Muscles can produce very strong forces when they contract. But they cannot make themselves very much shorter. Suggest why the real biceps is attached in this position.