What is the evolutionary advantage of a protonephridia or metanephridia over diffusion?

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22-08-2022
Biology

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What is the evolutionary advantage of a protonephridia or metanephridia over diffusion?

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Yakavi Yakavi · Answer 1 · 2022-08-30T02:22:58-04:00

The evolutionary advantage of a protonephridia or metanephridia over diffusion are It is faster and more effective for removal of nitrogen waste

The protonephridium is an excretory tube with no internal opening. Platyhelminthes, Rotifers, and certain Chordates contain it. The tubule's end is lined by solenocytes (flagellated) or flame cells (ciliated). They aid osmoregulation. The cilia or flagella generate an outward current, which results in a partial pressure. This partial pressure drives the animal's waste metabolites. The excretory fluid is expelled by the nephridiopore or the external aperture.

Metanephridium is an excretory organ found in arthropods, annelids, and molluscs. It contains ciliated funnel structures that enter into a body cavity and are connected to a duct. This structure is now exposed to the outside world of the invertebrate. The excretory product acquired by blood filtration is later converted into urine.

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