What happens to bones in space?

If astronauts don't exercise, their bodies start losing bone and muscle. Bone and muscle loss mean decreased size and strength, and can reduce an astronaut's ability to do work because it makes them weak.Once they land on Earth, weakened muscles and bones would make walking difficult.
                                                                   Bones are not unchanging calcium structures; they constantly reshape themselves in relation to the stress that is put on them. Just like muscles, if you don't use your bones, they will weaken. Bone loss occurs in the weightless environment of space because bones no longer have to support the body against gravity. On Earth, gravity applies a constant mechanical load to the skeletal system, that causes healthy bones to maintain a certain density so that they are able to support the body.

                                                                                           ⧪ MEDICOS X⧪