PRESENTER:'It's quiet and everyone is fast asleep.' PRESENTER:Muscles and bones keep us moving 24 hours-a-day, even when we're asleep. Without muscles or bones, we wouldn't even be able to get out ...

AHS-tee-o-klasts), which break down bone and help to sculpt and shape it Muscles pull on the joints, allowing us to move. They also help the body do such things as chewing food and then moving it ...

What Are Bones and What Do They Do? Bones provide support for our bodies and help form our shape. Although they're very light, bones are strong enough to support our entire weight. In this soft bone ...