name the cells which help in maintaining a current of water through the porifera body
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The essential elements of the water-current system include the pores, or ostia, through which water enters the sponge (incurrent system); the choanocytes, or collar cells, which are flagellated cells that generate water currents and capture food; and the oscula, openings through which water is expelled (excurrent ...
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in addition to the oscolum,sponges have multiple pores called ostia
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