Effect of spaceflight on the human body of muscle fibre prominent in muscles also change. Slow twitch endurance fibres used to maintain posture are replaced by fast twitch rapidly contracting fibres that are insufficient for any heavy labour. Advances in research on exercise, hormone supplements and medication may help maintain muscle and body mass. Bone metabolism also changes. Normally, bone is laid down in the direction of mechanical stress. However, in a microgravity environment there is very little mechanical stress. This results in a loss of bone tissue approximately 1.5% per month especially from the lower vertebrae, hip and femur. Due to microgravity and the decreased load
Spirit body this spirit body. When a spirit body enters into the mortal body and framework through the process of mortal birth, a temporary joining occurs, creating what is called a "soul." Upon mortal death, the spirit body of a person leaves the mortal body and returns to the spiritual realm to await the resurrection. The resurrection is where God raises the mortal body the spirit personage had lost in mortal death, and converts the mortal body from flesh, bone and blood, into immortal bodies of flesh and bone, then rejoins the two, never to be separated again. This is the meaning