Water movement in sponges are caused by the beating of the flagella found in

Water movement in sponges are caused by the beating

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Water movement in sponges are caused by the beating of the flagella found in the choanocytes that line the spongocoel and radial canals. The rotary motion of the flagellum forces water currents to move into the sponge and this moving water creates an area of low pressure above the excurrent openings that assists in drawing water outof the sponge. The asconoid type of canal system possess the simplest pathway for the entrance and exit of water. Water first enters through the porocytes, travels through the spongocoel and is brought back out through the osculum. The synconoid type of canal system exhibits a more complex path for water input and output. Water enters through the ostia, travels through the incurrent canals, further moves to the propyle that leads to the radial canals lined with choanocytes, into the spongocoel, finally leaving through the osculum. The leuconoid type of canal system manifest the most complex avenue of water entrance and exit. Water enters through the ostia, into the incurrent canals, to the propyle that leads to the radial canals lined with choanocytes, exits through the apopyle to the general exit (spongocoel), then to the excurrent canal, finally, out through the osculum. References: Pechenik, J.A. (2005). Biology of the Invertebrates, 5th Edition. New York: McGraw-Hill Companies, Inc. Engemann, R. & Hegner J. (1981). Invertebrate Zoology, 3rd Edition. New York: Macmillan Publishing Co. Inc.
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  • Spring '17
  • Samuel Go
  • Asconoid, Poriferans, Sclerocyte, gemmules

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