WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Paramecium. Light microscope footage of several ciliate protozoa, Paramecium caudatum. The clip shows pulsation cycles of the contractile vacuoles (circular, with ray-like structures). Contractile vacuoles act as osmotic regulators, actively expelling excess water from the cell. Paramecium are abundant in water and soil. They move by the rhythmic beating of many hair-like cilia, feeding mainly on bacteria which are digested within temporary vacuoles which float in the cell cytoplasm. Filmed with differential interference contrast illumination.
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