paramecium![click to hear](/images/speaker.jpg)
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.
cilium ![click to hear](/images/speaker.jpg)
Filament-like extension of the cytoplasmic membrane allowing the cell and certain substances on its surface to move about.
plasma membrane ![click to hear](/images/speaker.jpg)
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](/images/speaker.jpg)
Depression lined with cilia, which undulate to direct food particles toward the cytostome.
cytostome ![click to hear](/images/speaker.jpg)
Opening corresponding to the mouth and allowing ingestion of food and rejection of undesirable elements.
cytopharynx ![click to hear](/images/speaker.jpg)
Fold of the plasma membrane; food particles originating in the cytostome are directed toward it.
cytoproct ![click to hear](/images/speaker.jpg)
Orifice corresponding to the anus; the food vacuole opens into it, allowing waste to be eliminated.
contractile vacuole ![click to hear](/images/speaker.jpg)
Spheroid cavity acting as a pump to evacuate excess water and waste from the cell.
cytoplasm ![click to hear](/images/speaker.jpg)
Clear gelatinous substance surrounding the various cellular structures.
macronucleus ![click to hear](/images/speaker.jpg)
Large nucleus controlling cellular activities.
micronucleus ![click to hear](/images/speaker.jpg)
Small nucleus ensuring cell reproduction.
food vacuole ![click to hear](/images/speaker.jpg)
Spheroid cavity in which food particles from the cytopharynx are digested.