Osmorégulation
The osmoregulation is the Régulation of the concentration in salt S dissouts in the internal fluids of a watery living being.
Capacity of homeostasis
Two strategies clash, either the species tand to have a salinity interns near to the external medium and it is known as “osmoconformes”, or it seeks with concerver a clean salinity and the species is known as “osmorégulatrice”.In addition, an organization which can undergo a strong change of internal concentration out of salts is known as Euryhaline, an organization which cannot undergo of strong change of internal salinity is known as Sténohaline. The capacities of osmoregulation are limited for all the living beings, i.e. that the margin of variation of salinity which they are able to support are limited. When a certain tolerance of salinity is exceeded, to more or less short term, they cannot provide energy to maintain to them Homéostasie and die.
Principle
The marine species must fight against the escape of fresh water of their organization towards the seamen circle while the species Dulçaquicole S fight to preserve the salinity of their body. Homeostasis is consequently not obtained same manner.
Plants
There are no bodies of the specific osmoregulation at the plants. The phenomenon is regulated by perspiration.
Marine animals
See also: Hypertonic
To fight against the osmotic , rather low pressure in sea water, them Poisson S avalent unceasingly of sea water, filters it thanks to their wall intestinal and rejects it by their apparatus excretor. In supplement of the Kidney S, the marine tortoises have gland close to their eyes for excretion of the salt surpluses of their blood circulation.
The salt density, at sea, can change substantially after a tropical rain in addition the specific density of sea water varies with the temperature. The majority of the récifaux animal animals are osmoconformes and has capacities very limited on the matter. They have need to live of a fork of precise salinity. These invertebrates maintained with weak densities decay very quickly, including the practically immortal sponge S under optimum conditions.
Fresh water animals
See also: Hypotonic
The phenomenon is opposite at the fresh water species, namely that an important excretion of urine makes it possible to lute against the hydration.
See too
Related articles
External bonds
- Temperature and density of Ronald L. SHIMEK
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