Biology: The Dynamic Science (Mind...

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



Biology: The Dynamic Science (Mind...

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

Apply Evolutionary Thinking What is the advantage of a tubelike digestive system over a saclike digestive system?

Summary Introduction

To review:

The advantage of a tube-like digestive system over a sac-like digestive system.


Most invertebrates and all vertebrates show extracellular digestive system consisting of a digestive tract along with digestive organs. Based on the mode of survival, the basic digestive system of vertebrates undergoes a multitude of structural and functional variations.


The sac-like digestive system is found in primitive organisms where mainly the body cavity functions as the digestive system, ingesting the food through the mouth, with the digestion and absorption taking place in the sac-like organ(s). There are no other specialized digestive organs.

The tube-like digestive system is a complex system involving specialized organs to meet the requirements of digestion and absorption of complex food nutrients or molecules. The tube-like structure is called the digestive tract/digestive tube/gut/gastrointestinal tract or the alimentary canal. The digestive tract is a specialized tube in which the digestive contents move in one direction from the mouth to the anus...

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