Biology / Unit 13 Bio 3243 short lesson, about 20 seconds
Excretory Organs Across Taxa: Flame Cells, Malpighian Tubules, Nephridia
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The idea
Non-vertebrate excretion solves filtration without the nephron's three-step architecture, instead using taxon-specific organs — flatworm flame cells, insect Malpighian tubules, and annelid nephridia — each achieving the same filtering goal by a different structural route.
In practice
Malpighian tubules concentrate uric acid before it exits with feces, conserving water on land.
Where people slip
These organs solve the nephron's same problem without sharing its filtration-reabsorption-secretion structure.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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