Quiz 30: Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation

Biology

Homeostasis: Homeostasis is the ability of the body or a cell to seek and maintain a condition of equilibrium or stability within its internal environment when dealing with external disturbances. The evolutionary advantage for a species that might result from successful maintenance of internal homeostasis is that it allows an organism to function effectively under a broad range of environmental conditions.

Marine invertebrates have to remove the excess water that enters into their body against the concentration gradient. In sea water, invertebrates are osmoconformers as they are not able to regulate the osmotic pressure of their body fluid. The concentration of salt when these animals are in sea water is almost same inside and outside the cell. These organisms have a very limited ability to withstand the osmotic change. This restricts them from entering into the freshwater as the water rushes into the cell in such environment. Hence, limitation to osmotic variability in marine invertebrates confronts them from entering into the freshwater. Marine invertebrates have to remove the excess water that enters into their body against the concentration gradient. In sea water, invertebrates are osmoconformers as they are not able to regulate the osmotic pressure of their body fluid. The concentration of salt when these animals are in sea water is almost same inside and outside the cell. These organisms have a very limited ability to withstand the osmotic change. This restricts them from entering into the freshwater as the water rushes into the cell in such environment. Hence, limitation to osmotic variability in marine invertebrates confronts them from entering into the freshwater.

Osmotic conformity is a process in which the animal is unable to regulate the osmotic pressure of its body fluids while osmotic regulation is a process by which the animal is able to regulate its body fluids accordingly and can live in a wide range of salinity changes. Stenohaline organisms are those organisms that can survive in a narrow range of salinity. They cannot withstand a wider range of fluctuations in salinity. On the other hand, euryhaline organisms can survive in a wide range of salinity changes. Hyperosmotic organisms maintain their body fluids at a higher concentration than the surrounding water. On the other hand, hypoosmotic organisms maintain their body fluids at a lower concentration than the surrounding water.

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