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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

How are protonephridia, metanephridia, and Malpighian tubules different? In which animal groups are each of these excretory tubules found?

Summary Introduction

To review:

The differences among protonephridia, metanephridia, and malpighian tubules, and also the group of animals in which these excretory tubules are found.

Introduction:

The total solute concentration of a solution is called its osmolarity. Osmolarity is measured in osmoles, that is, the number of solute molecules and ions (in moles) per liter of the solution. The invertebrate osmoregulators typically use specialized tubules for carrying out excretion. The three common types of specialized tubules are protonephridia, metanephridia, and malpighian tubules.

Explanation

The differences among excretory tubules: protonephridia, metanephridia, and malpighian tubules, and also the group of animals in which these tubules are found, are given in the table below:

Protonephridia Metanephridia Malpighian tubule
It is found in flatworms and larval mollusks. It is found in annelids. It is found insects and other arthropods.
They occur in pairs. They occur in pairs. They occur as a tuft.
They produce urine...

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