In cases where large ulcer has consumed the deep layer, which engenders the epidermis, or where this layer is destroyed a significant burn, processes healing present many instructive. From underlying tissues that under normal conditions, do not participate in the outer growth occurs new leather or should I say, replacing the skin layer, because it does not contain no hair follicles or other accessories of this layer of the skin. However, this layer is so similar to a real epidermis, which as it is constantly renewed defensive cover. Of course, it can be argued that this method of origin of the skin is the result the inherited tendencies to the desire to restore damaged structure of a certain character. Nevertheless, we cannot fail to recognize direct influence of environment, referring to the above facts or remembering another fact that the burned surface of the skin, not protected from of air action and secretes the shell of a collapsible lymph. But we can cite other evidence that directly effect the environment is the main factor. An accident or illness cause sometimes falling of the mucous membrane. After the state of rastajimosti first substantial but gradually decreasing as the onset of change, this the shell adopts the General character of ordinary skin. But that's not all, changes its microscopic structure. Where the mucous membrane this species is covered with cylindrical epithelium, the cylinders gradually decrease, becoming completely flat, so that a flake the epithelium, i.e., a structure very close to the structure of the epidermis. Here already you cannot refer to the desire to fill the broken type, because here, on the contrary, we are dealing with a deviation from the type. Effect of environment so great that in a short time it osilivaet inherited tendency and causes structure, the opposite of normal.
In their subsidiary work "The Variation of Animals and Plants under Domestication", where Darwin considers the issue in detail, he gives more extensive evidence of inherited effects of use and disuse. Give some of these places, taken from the first volume first edition. Speaking of pet rabbits, Darwin writes: "a Lack of exercise obviously, changed the length of the legs relative to the body..." "Thus, we see what is the most important and complex organ (the brain) throughout your organization subject to the law of decrease in mass from disuse". Darwin notices that the birds of oceanic Islands that are not pulled persecution the enemies, the reduction of the wings has occurred, in all probability, from gradual disuse. Comparing one of these birds - coots with Tristan da Cunha with the relevant European bird and showing that all the bones involved in flight, at first is less than, Darwin adds: "Thus, in the skeleton of this natural species nearly meet such same modifications, except went a little further, like home ducks; and in the latter case, I think no one will dispute that such changes have occurred from the reduction in the use of the wings and reinforced use your legs... Like other Pets, very tame for a long time, just like that of silkworms suffered some instinct; the caterpillars, when placed on a mulberry tree, sometimes becoming strange the disadvantage to devour the base of the sheet on which they are located, and through the to fall down; but according to Robin (Robmet), they retain the ability again to climb the tree. But sometimes this ability is lost; and then fell caterpillar, not being able to get up, die of starvation; often they are not able to move from leaf to leaf".
2 comments:
In cases where large ulcer has consumed the deep layer, which engenders
the epidermis, or where this layer is destroyed a significant burn, processes
healing present many instructive. From underlying tissues that
under normal conditions, do not participate in the outer growth occurs
new leather or should I say, replacing the skin layer, because it does not contain
no hair follicles or other accessories of this layer of the skin.
However, this layer is so similar to a real epidermis, which
as it is constantly renewed defensive cover.
Of course, it can be argued that this method of origin of the skin is the result
the inherited tendencies to the desire to restore damaged
structure of a certain character. Nevertheless, we cannot fail to recognize
direct influence of environment, referring to the above facts or
remembering another fact that the burned surface of the skin, not protected from
of air action and secretes the shell of a collapsible lymph. But we can
cite other evidence that directly effect the environment
is the main factor. An accident or illness cause sometimes falling
of the mucous membrane. After the state of rastajimosti first
substantial but gradually decreasing as the onset of change, this
the shell adopts the General character of ordinary skin. But that's not all,
changes its microscopic structure. Where the mucous membrane
this species is covered with cylindrical epithelium, the cylinders gradually
decrease, becoming completely flat, so that a flake
the epithelium, i.e., a structure very close to the structure of the epidermis. Here already
you cannot refer to the desire to fill the broken type, because here,
on the contrary, we are dealing with a deviation from the type. Effect of environment so
great that in a short time it osilivaet inherited tendency and
causes structure, the opposite of normal.
In their subsidiary work "The Variation of Animals and Plants
under Domestication", where Darwin considers the issue in detail, he gives
more extensive evidence of inherited effects of use and
disuse. Give some of these places, taken from the first volume
first edition.
Speaking of pet rabbits, Darwin writes: "a Lack of exercise
obviously, changed the length of the legs relative to the body..." "Thus, we see
what is the most important and complex organ (the brain) throughout your organization
subject to the law of decrease in mass from disuse". Darwin notices
that the birds of oceanic Islands that are not pulled persecution
the enemies, the reduction of the wings has occurred, in all probability, from
gradual disuse. Comparing one of these birds - coots with
Tristan da Cunha with the relevant European bird and showing
that all the bones involved in flight, at first is less than, Darwin adds:
"Thus, in the skeleton of this natural species nearly meet such
same modifications, except went a little further, like home
ducks; and in the latter case, I think no one will dispute that
such changes have occurred from the reduction in the use of the wings and reinforced
use your legs... Like other Pets, very tame
for a long time, just like that of silkworms suffered some instinct;
the caterpillars, when placed on a mulberry tree, sometimes becoming strange
the disadvantage to devour the base of the sheet on which they are located, and through the
to fall down; but according to Robin (Robmet), they retain the ability again
to climb the tree. But sometimes this ability is lost; and then fell
caterpillar, not being able to get up, die of starvation; often they are not
able to move from leaf to leaf".
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