Concept
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Flame Cells of Planaria and Nephridia of Worms
Flame cells and nephridia
In the excretory system of the (a) planaria, cilia of flame cells propel waste through a tubule formed by a tube cell. In (b) annelids, nephridia filter fluid from the body cavity.
Source
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"OpenStax College, Excretion Systems. October 17, 2013."
http://cnx.org/content/m44810/latest/Figure_41_02_02.jpg
OpenStax CNX
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