LM of the ciliate protozoan Paramecium sp.

LM of the ciliate protozoan Paramecium sp.

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Credit: DR DAVID PATTERSON/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of the ciliate protozoan Paramecium sp., showing several digestive vacuoles (brown) & two large contractile vacuoles (white, star-shaped objects). Paramecium are abundant in water and soil. They have a permanent mouth & feed mainly on bacteria. These are digested within temporary digestive vacuoles which float within the cell cytoplasm. The contractile vacuoles act as osmotic regulators, controlling the flow of water across the ciliate's membrane. They are surrounded by a halo of radiating channels; excess water collects in the channels, drains into the vacuole & is then discharged through a pore at the surface. Magnification unknown.

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Keywords: animal, ciliate, contractile vacuole, digestive vacuole, food vacuole, invertebrate, invertebrates, light micrograph, nature, of paramecium, paramecium, paramecium sp., protozoa, protozoan, wildlife, zoology

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