ÑóẊîöʼn
28th September 2003, 14:55
Originally posted by COMRADE
[email protected] 27 2003, 10:18 PM
It's not only about muscle atrophy although that is yet another complication on the human body. Every gravity sensitive organ will be affected by prolonged exposure to zero gravity do to there no longer being any atmpospheric pressure. As far as bones are concerned, within zero gravity, the upper stream will produce a much lower level of bone mass than normal while the lower stream (that which regulates bone destuction) continues to escalate. Bone tolerance will also decrease, causing much lower level of calcium. these lower levels of calcium within the body will also begin to affect the health of the person eventually.
Emphasis added.
You are confusing gravity, the force that pulls us down to the Earth, and atmospheric pressure, which is constantly pushing a ton (Tonne?) of weight onto our body at any one time (This pressure decreases as you gain altitude.)
Think about it. as your body is constantly pushing against the atmosphere, as is liquids and gas.
Liquids and gas, when exposed to a vacuum, will spread as far as possible, wich is why water boils at lower tempuratures at higher altitudes.
When your body is put in a vacuum, it's devastating: your blood and other fluids (Lymph, saliva, digestive juices etc.) boil, your body swells (bones and teeth to a much lesser degree) as your cell are in effect bags of fluid, and your eyes may pop. blood vessels and internal organs may also burst, especially if you have recently eaten a sizable meal.
Any air left in your lungs that wasn't sucked out on the first few seconds of exposure will damage them as it expands. The same is true for intestinal wind. (Yuk!)
I won't explain what happens to your genito-urinary system, as I think you get the picture, but I will if you want me to(!)
Gravity in suffecient amounts is what stops liquids and gases expanding, (Which is why our atmosphere isn't boiling away) which I think is what your getting at, and you're right, but their being no gravity (or rather microscopic amounts) pressure in spacecraft is maintained like gas in a bottle