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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

Apply Evolutionary Thinking From what you have learned in this chapter and in Chapter 32, do you think lungs evolved once, or on several occasions? Justify your answer.

Summary Introduction

To review:

Whether lungs evolved once or on over several occasions.

Introduction:

Lungs are air-filled, spongy organs of respiration located on either side of the thorax. They consist of tubular branches called bronchi, which divide into smaller and narrower branches called bronchioles. The bronchioles further branch into a cluster of microscopic air sacs, called alveoli. Lungs helped animals to adapt to the terrestrial environment.

Explanation

The lungs have evolved over several occasions through the process of natural selection or mutation. They evolved in some fishes as an adaptation for survival in oxygen-poor water or in exposed air, which is deficient of water.

The swim bladders in fishes and lungs in land vertebrates are similar organs but possess different functions. The lungs are used for breathing, while swim bladders are used to control buoyancy...

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