bone

1 - Scientists will also study why astronauts who stay in space for long periods of time lose bone and muscle mass.

2 - About half of the volume of blood is made up of blood cells, which originate in the bone marrow.

3 - Experts predict that bone fractures will become a bigger and more costly problem unless more is done to prevent them.

4 - One of the valuable properties of bone is that when it endures repeated stress it responds by becoming denser and stronger.

5 - Scientists estimate that an individual bone has a one to three per cent lifetime risk of fracture, based on data from a variety of species.