Superheroes save the world by using their strong muscles to lift or move very heavy things and also to fly.
Everyday folks use their muscles to carry them from one place to another, for breathing, for lifting reasonably heavy things and for…. Can you list five other things that we use our muscles for?
Then, visit this Muscle contraction animation.
Try to answer the self-quiz questions at the end of the animation.
As a review, check out this YouTube video.