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paramecium click to hear : paramecium

Ovoid-shaped one-cell organism generally found in freshwater and covered with cilia, which allow it to move about and to feed, mainly on bacteria.
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cilium plasma membrane peristome cytostome cytopharynx forming food vacuole cytoproct contractile vacuole cytoplasm macronucleus micronucleus food vacuole

cilium click to hear : cilium

Filament-like extension of the cytoplasmic membrane allowing the cell and certain substances on its surface to move about.

plasma membrane click to hear : plasma membrane

The cell’s flexible outer casing; it separates the cell from the surrounding environment and works as a filter to control the entry and exit of certain substances.

peristome click to hear : peristome

Depression lined with cilia, which undulate to direct food particles toward the cytostome.

cytostome click to hear : cytostome

Opening corresponding to the mouth and allowing ingestion of food and rejection of undesirable elements.

cytopharynx click to hear : cytopharynx

Fold of the plasma membrane; food particles originating in the cytostome are directed toward it.

forming food vacuole click to hear : forming food vacuole

The paramecium continually produces food vacuoles out of cytoplasmic membrane. Each food vacuole traps food particles accumulated in the bottom of the cytopharynx.

cytoproct click to hear : cytoproct

Orifice corresponding to the anus; the food vacuole opens into it, allowing waste to be eliminated.

contractile vacuole click to hear : contractile vacuole

Spheroid cavity acting as a pump to evacuate excess water and waste from the cell.

cytoplasm click to hear : cytoplasm

Clear gelatinous substance surrounding the various cellular structures.

macronucleus click to hear : macronucleus

Large nucleus controlling cellular activities.

micronucleus click to hear : micronucleus

Small nucleus ensuring cell reproduction.

food vacuole click to hear : food vacuole

Spheroid cavity in which food particles from the cytopharynx are digested.