The circulatory system
in zero gravity
Ramin Amir mardfar
circulatory system in zero gravity
A kind of fish called Ceratioide lives in the darkness of the
depths of the sea, and the male (ceratias) is very smaller than its female
(linophryne). When the males become mature, they lose their appetency and
they ovoid eating, and if they can not find a female before the fat under
their skin finishes, they will starve. When the male found the female
fish, it sticks its teeth to the soft part of the body of female shark and
so it hangs from female and gradually it goes inside the female's body.
Then, gradually it loses its sensuous members and other body members
including digestive members. The only members, which remain and are
active, are its gonads. The male fish provides all its required materials
from female's blood, including oxygen and food.
The parasite worms of intestine also lack digestive members.
Although their ancestors had these members, but by commencement of
parasitism, these members have been disappeared in their body, and the
digested and prepared food is absorbed by their skin. Digestion of food
outside the body leads to interesting. If an animal with advanced
digestive system comes toward such a way of nutrition; this question is
posed that, what is the use of digestive system. The nature usually
doesn't like wastage and most of the members will die or will be
Is it possible that the circulatory system of animals have such a
situation? When the body doesn't need a system, the nature gradually will
destroy it. The body doesn't need a complicated circulatory system in
certain condition, does this system becomes simple gradually and its
complicated parts disappear?
Most of the energy of circulatory system is used to overcome the
gravity. If an animal is placed in an environment, which has no gravity,
the circulatory system will have less duty and because the nature wants to
save and tries to prevent the waste of energy, will want to omit the
circulatory system. The situations, in which these are no gravity, are
provided in spaceships. The animals, which are placed in the orbit of
earth by the spaceships, are in the condition of the gravity of zero, and
their body will have a strange look toward the circulatory system. The
circulatory system does not have more duty in the body of these animals,
because there is no gravity to overcome and to drive the blood with more
force upwards. The first action of the body to prevent the loss of energy
by the circulatory system is to decrease the pulsation of heart and
decrease the volume of the heart. This action occurs after that the animal
is placed at the gravity of zero. How would be the effects of the gravity
of zero in long time? And at the gravity of zero, which parts of the
circulatory system the body will omit?
The main role of the blood vascular system is to carry the required
material to different parts of the body. Some materials move in the blood
vessels by themselves, but some other materials, especially gases, move on
red cells. In each millimeter of the blood there is about 4.5 to 5 million
red cells. These red cells live for 120 days and the body has to renew
them every 120 days. To produce the large amount of red cells, the body
needs an of energy. At low gravity the body wants to decrease these costs.
In the earthworm there is no red cell and hemoglobin moves in the blood in
the from of solution, but this is not a suitable way, and have low
efficiency in high gravity, large animals do not this way. But at the
gravity of zero there is no need for more output, whit the same
circulatory system, it is possible to send the required materials to cells
without red cell. At the gravity of zero, the body considers the red cell
as the wastage of the energy and tries to eliminate them. At the gravity
of zero the hemoglobin, which is dissolved in blood, can send the required
materials to the cells of body without the help of red cells.
At the gravity of zero vein valves are no needed, and may be the
body puts them aside. Eventually, at the gravity of zero the body will
think to make the circulatory system as simpler as it can, so it prevents
the wastage of energy.
Beside the circulatory system, preserver system of the body is
related to the gravity, too. When the animal is at the gravity of zero,
its body do not need for strong bones to keep it standing, so at the
gravity of zero the body will think to eliminate them, and as we know, the
animals which are placed at orbit of the earth, the precipitate of calcium
in their which are placed at orbit of the earth, the precipitate of
calcium in their bones decrease and their bones become supple, and this is
a commencement of eliminating of the bones.