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Studies have been done which showed that when bones are relieved of the burden of bearing weight, bone precursor cells fail to respond to insulin-like growth factor one or IGF-I, a biochemical regulator that plays a key role in the proliferation of most cell types.
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What causes density to decrease?
an increase in volume and/or a decrease in mass
Why should astronauts exercise regularly while on a space mission?
While in weightlessness, your bone density and muscle mass decrease as you don't use them. So, by doing several hours of exercise a day, you are using the muscles and bones, therefore, the bone density and muscle mass do not decrease as much as they would if they didn't exercise.
What cellular activity causes increase in bone mass?
osteoblasts secrete matrix; bone deposition
What is the opposite of Dark Energy?
There is no opposite of dark energy in the sense that there exists something that is the exact opposite of dark energy. Dark energy speeds the rate of expansion of space, even empty space, and gravity, mass, or matter causes the opposite in that it causes a decrease in the rate of expansion of space in areas that have matter.
Why do astronauts face problems in space?
They can get bored, loss of muscle and bone mass, space sickness.
Will the mass of melted ice decrease?
No, but it will take up slightly less space after melting.
Do you increase or decrease in mass?
you increase or decrease mass by taking the mass out
How the mass appears to changes during transit?
settling that eliminates space causes this
Living in space how it effects human body?
Loss of muscle tone and bone mass, among others.
What percent of bone tissue is replaced each year?
Osteoporosis is a skeletal disorder characterized by low bone mass, ... ofestrogen replacement therapy, from 3 percent to 7 percent per year, building to15 percent ... a decrease in the replacement of old bone with new bone tissue
When an astronaut is propelled into space does his mass increase or decrease?
The mass of an astronaut in space does not change, except for the minor changes that occur due to change in exercise and eating. Mass is mass, and represents the amount of material in an object. His weight, however, does change, because weight is mass times the acceleration due to gravity, and gravity does indeed change.
When an astronaut goes to the moon which will decrease his mass or his weight?
The astronaut from the country that has a space program that wants to send a person to the moon's weight will decrease due to the fact that weight is directly related to gravity.
