When a muscle is relaxed it is ____ and ____.
Long and thin
What do the muscles in the torso allow us to do?
Rotate our bodies and bend at the waist
What do the muscles in the head allow us to do?
Smile, chew, and speak
Muscles are organs which can change in ____ and ____.
Length and shape
When a muscle is contracted it is _____ and _____.
Shorter and thicker
The muscular system consists of all the ______ in the body.
Muscles
What do the muscles in the limbs allow us to do?
Move our arms, legs, hands, and feet