Lions are carnivorous mammals that hunt their prey. The forelimb of a lion has the same basic structure as the arm of a human. The diagram shows the bones in the forelimb of a lion. [Figure: lion forelimb with bones X, Y, ulna]

1. (a)State the name of: bone X ................................................................................................................................................................................... the muscle between bones X and Y. ...................................................................................................................................[2]
2. (b)(i)Lions can only run quickly for a short time. This means they have to get close to their prey before accelerating to maximum running speed. Name the process used to release energy in the muscles of the forelimb when the lion starts to run after its prey.[1]
3. (b)(ii)Explain why the lion can only run at maximum speed for a short time.[2]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.