Floating in space sounds cool, isn’t it? You can just float everywhere without using much of your force and energy that you spend on walking(moving).
But what is this Artificial Gravity? Simply in a layman’s terms its just like gravity that binds us to Earth (or) Moon to Earth and the Planets to a Solar System (or to the Sun). More technically – Artificial gravity is the varying (increase or decrease) of apparent gravity (g-force) via artificial means, particularly in space, but also on the Earth [via wikipedia.org].
Thinking it as a unnecessity is somewhat stupidity.
Under absence of gravity following might happen:
1.Fluid redistribution and loss:
Gravity binds the fluid flow of our body and it’s a self sustainable process which works under effect of gravity that our body pumps the fluid across properly, under micro gravity effect the fluid might coagulate at various ends in our body causing excess of it there and deficiency somewhere else, also The brain interprets the increase of fluid in the cephalic area as an increase in total fluid volume. In response, it activates excretory mechanisms. This compounds calcium loss and bone demineralization. Blood volume may decrease by 10 percent, which contributes to cardiovascular deconditioning.
Changes in fluid distribution lead to imbalances in potassium and sodium and disturb the autonomic regulatory system.
3. Red blood cell loss:
Blood samples taken before and after American and Soviet flights have indicated a loss of as much as 0.5 liters of red blood cells. Scientists are investigating the possibility that weightlessness causes a change in splenic function that results in premature destruction of red blood cells. In animal studies there is some evidence of loss through microhemorrhages in muscle tissue as well.
- Muscle Damage:
Muscles atrophy from lack of use. Contractile proteins are lost and tissue shrinks. Muscle loss may be accompanied by a change in muscle type: rats exposed to weightlessness show an increase in the amount of “fast-twitch” white fiber relative to the bulkier “slow-twitch” red fiber. In 1987, rats exposed to 12.5 days of weightlessness showed a loss of 40 percent of their muscle mass and “serious damage” in 4 to 7 percent of their muscle fibers. The affected fibers were swollen and had been invaded by white blood cells. Blood vessels had broken and red blood cells had entered the muscle. Half the muscles had damaged nerve endings. The damage may have resulted from factors other than simple disuse, in particular: stress, poor nutrition, and reduced circulation — all of which are compounded by weightlessness; and radiation exposure — which is independent of weightlessness.
- Bone Damage:
Bone tissue is deposited where needed and resorbed where not needed. This process is regulated by the piezoelectric behavior of bone tissue under stress. Because the mechanical demands on bones are greatly reduced in micro gravity, they essentially dissolve. While cortical bone may regenerate, loss of trabecular bone may be irreversible. Diet and exercise have been only partially effective in reducing the damage. Short periods of high-load strength training may be more effective than long endurance exercise on the treadmills and bicycles commonly used in orbit. Evidence suggests that the loss occurs primarily in the weight-bearing bones of the legs and spine. Non-weight-bearing bones, such as the skull and fingers, do not seem to be affected.
6.Space Adaptation Syndrome: About half of all astronauts and cosmonauts are afflicted. Symptoms include nausea, vomiting, anorexia, headache, malaise, drowsiness, lethargy, pallor and sweating. Susceptibility to Earth-bound motion sickness does not correlate with susceptibility to space sickness. The sickness usually subsides in 1 to 3 days.
7.Interference with medical procedures:
Fluid redistribution affects the way drugs are taken up by the body, with important consequences for space pharmacology. Bacterial cell membranes become thicker and less permeable, reducing the effectiveness of antibiotics. Space surgery will also be greatly affected: organs will drift, blood will not pool, and transfusions will require mechanical assistance