Add Yahoo as a preferred source to see more of our stories on Google. Muscles are amazing. They're what let you strum a guitar, kick a soccer ball and high-five your friends. When you decide to move, ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. What makes the cells of the muscles contract? – ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...