what help in expelling excess water from. unicellular fresh water organism
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Fresh water is hypotonic to the intracellular environnment of the fresh water organisms. This means that the water influx in the cytoplasm of the organism due to osmosis will be quite high.
The high influx of water molecules into the cytoplasm thus requires that the organism to employ a mechanism of getting rid of this excess water that would otherwise cause the bursting and death of the cells.
Unlike mutilcellular organisms like fresh water fish that can utilize production of a lot of urine to get rid of the excess water, unicellular organisms such as amoeba do not have such elaborate mechanisms.
One mechanism, though, that unicellular organisms do employ in getting rid of the excess water, is by the use of the structure known as contractile vacuoles.
Contractile vacuoles are present in many protists and unicellular algae and are the structures that are involved in osmoregulation by getting rid of the excess water.
The contractile vacuole gets filled up with water in the cell and moves to the cell membrane where it contracts and expels out the water in it. The process is repeated in many cycles to remove the excess water as a result of the constant influx of water molecules due to osmosis.
The high influx of water molecules into the cytoplasm thus requires that the organism to employ a mechanism of getting rid of this excess water that would otherwise cause the bursting and death of the cells.
Unlike mutilcellular organisms like fresh water fish that can utilize production of a lot of urine to get rid of the excess water, unicellular organisms such as amoeba do not have such elaborate mechanisms.
One mechanism, though, that unicellular organisms do employ in getting rid of the excess water, is by the use of the structure known as contractile vacuoles.
Contractile vacuoles are present in many protists and unicellular algae and are the structures that are involved in osmoregulation by getting rid of the excess water.
The contractile vacuole gets filled up with water in the cell and moves to the cell membrane where it contracts and expels out the water in it. The process is repeated in many cycles to remove the excess water as a result of the constant influx of water molecules due to osmosis.
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One mechanism, though, that unicellular organisms do employ in getting rid of the excess water, is by the use of contractile vacuoles.
Contractile vacuoles are present in many protists and unicellular algae and are the structures that helps in osmoregulation by getting rid of the excess water.
The process is as follows
The contractile vacuole gets filled up with water in the cell and moves to the cell membrane where it contracts and expels out the water present in it. The process is repeated in many cycles to remove the excess water as a result of the constant influx of water molecules because of osmosis.
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