HELLO EVERYONE,PLS TELL WHY OSMOREGULATION IS NECESSARY IN AQUATIC ORGANISMS.......?
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Answer:
Osmoregulation is the active regulation of the osmotic pressure of an organism 's fluids to maintain thehomeostasis of the organism 's water content; that is it keeps the organism 's fluids from becoming too diluted or too concentrated. Osmotic pressure is a measure of the tendency of water to move into one solution from another by osmosis. The higher the osmotic pressure of a solution the more water wants to move into the solution. Pressure must be exerted onthe hypertonic side of a selectively permeable membrane to preventdiffusion of water by osmosis from the side containing pure water.
Organisms in both aquatic and terrestrial environments must maintain the right concentration of solutes and amount of water in their body fluids; this involves excretion (getting rid of metabolic wastes and other substances such as hormones that would be toxic if allowed to accumulate in the blood) via organs such as the skin and thekidneys; keeping the amount of water and dissolved solutes in balance is referred to as osmoregulation.
osmoregulation is important for body cells because it maintains the required concentrations of minerals and water in the cells .also helps in maintaining the shape and size of the cells . the excess of salt and water are expelled through special organs and thus right concentrations are maintained to keep the cell healthy and lively
For maintaining homeostasis, i.e. a state of equilibrium with the surrounding environment. This state is important for cell sustenance.
Marine bony fishes have hypotonic internal environment; so they are liable to lose water. Thus in order to conserve water, they constantly drink water. The salts taken in along with water are actively excreted by special excretory cells in the gills. Moreover, the filtration rate in their kidneys in very low, so small quantity of concentrated urine in excreted.
Unlike marine bony fishes, sharks and rays maintain relatively slightly hypertonic osmotic pressure of body fluids than their surroundings by storing high concentration of urea in their bodies. Thus they do not have problem of water loss. Excess salts are removed by special glands in their rectum. Marine invertebrates as well as hag fishes have isotonic body fluids, so they do not have osmoregulation Mechanism. Such animals are termed as osmoconformers...........
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