Contractile Vacuoles
A paramecium's contractile vacuole, here visualized using bright field light microscopy at 480x magnification, continuously pumps water out of the organism's body to keep it from bursting in a hypotonic medium.
Source
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"OpenStax College, Passive Transport. October 16, 2013."
http://cnx.org/content/m44417/latest/Figure_05_02_10.jpg
OpenStax CNX
CC BY 3.0.
