Nephridiopore

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A nephridiopore is a pore at the end of the nephridium, an excretory organ found in invertebrates, such as flatworms and annelids. [1] Nephridiopores open on the ventral surface of the body wall and allow metabolic wastes filtered by the nephridium to exit the body. [2]

Nephridia are homologous to nephrons or uriniferous tubules found in the kidneys of vertebrates. They occur in two forms: metanephridia, which begin with a nephrostome, and protonephridia, which begin with a flame cell. Fluids collected by the nephrostome or flame cell pass through a ciliated tubule, [3] where essential substances are reabsorbed through active mechanisms and waste products are secreted back into the lumen of the tube. [4] The resulting excretory fluid or urine is then passed out through the nephridiopore. [3]

References

  1. ↑ "nephridium | anatomy | Britannica". www.britannica.com. Retrieved 2022-03-08.
  2. ↑ "Lab 7: Annelids and Smaller Ecdysozoans". www.uwlax.edu. Retrieved 23 December 2025.
  3. 1 2 Molnar, Charles; Gair, Jane (2015-05-14). "22.3. Excretion Systems".
  4. ↑ "41.3B: Flame Cells of Planaria and Nephridia of Worms". Biology LibreTexts. 2018-07-17. Retrieved 2022-03-08.
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