What is the function of the contractile vacuoles of paramecia?

Answer 1

A contractile vacuole is a type of vacuole involved in osmoregulation. It pumps excess water out of a cell and is found prominently in freshwater protists.

In Paramecia , a common freshwater protist, the vacuole is surrounded by several canals, which absorb water by osmosis from the cytoplasm. After the canals fill with water, the water is pumped into the vacuole. When the vacuole is full, it expels the water through a pore in the cytoplasm which can be opened and closed. This pore has, in some forms of paramecium, disappeared entirely when not in use, leading to the idea of a "second cell" in paramecium.

Other protists, such as Amoeba, have contractile vacuoles that move to the surface of the cell when full and undergo exocytosis.

Retrieved from "http://en.wikipedia.org/wiki/Contractile_vacuole"

Answer 2

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A contractile vacuole is a type of vacuole involved in osmoregulation. It pumps excess water out of a cell and is found prominently in freshwater protists. In Paramecia , a common freshwater protist, the vacuole is surrounded by several canals, which absorb water by osmosis from the cytoplasm. After the canals fill with water, the water is pumped into the vacuole. When the vacuole is full, it expels the water through a pore in the cytoplasm which can be opened and closed. This pore has, in some forms of paramecium, disappeared entirely when not in use, leading to the idea of a "second cell" in paramecium. Other protists, such as Amoeba, have contractile vacuoles that move to the surface of the cell when full and undergo exocytosis.

Answer 3

Paramecium Contractile Vacuole

Answer 4

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What is the function of the contractile vacuoles of paramecia?

Answer 5

Contractile vacuoles helps freshwater protists like paramecia regulate the amount of water in their cells. This is called osmoregulation. Protists living in freshwater environments must tolerate a constant influx of water into their cells through osmosis. Without a way of releasing this water pressure, their cells would burst or lyse. To avoid this, protists use contractile vacuoles to pump excess water out of their cells and alleviate the pressure. Paramecia do not use contractile vacuoles to take in food. Instead, they take in food through their oral groove.

Answer 6

to expel excess water that is always diffusing in from the environment