Moving the Body

Muscles work in _________ pairs.

When muscle contracts, it becomes _________ and ___________.

The biceps and triceps are an example of __________ muscles.

The _______ muscles contracts when you bend your arm.

Which joint would you use to kick an ball ?

Which joint would you use to pick up a book?

Can a knee rotate like the shoulder? Why or why not?

Differentiate between a hinge joint and a ball and socket joint.

Name the pair of muscles involved in bending and straightening of arm.

Why do muscles need to work in pairs?