Fact 1: Muscles can only contract.

Fact 2: When contracted the triceps femoris pulls the thigh forward and extends the shank.

Given the two facts above, answer the question "The trcipes femoris is used to move what?" with the following options: 
- heat
 - Mass
 - Weight
 - feet
 - matter
 - people
 - embryos
 - bones


 

        bones 