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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

Tracheal systems are characterized by:

a. closed circulatory tubes that move gases.

b. spiracles that move gases between cells and body fluids.

c. body movements that compress and expand air sacs topump air.

d. positive pressure breathing, which swallows air into the body.

e. negative pressure breathing, which lowers air pressure at therespiratory surfaces.

Summary Introduction

Introduction:

The respiratory system of insects consists of air-filled tubes called trachea that helps in exchange of O2 (oxygen) and CO2 (carbon dioxide) between the body tissue and air. These tubes penetrate the body of the insects to facilitate gaseous exchange.

Explanation

Justification for the correct answer:

Option (c) states that body movement compresses and expands air sacs to pump air. This is a true statement because air enters and leaves the tracheal system at openings in exoskeleton called spiracles. These spiracles are open and closed in coordination with body movements that compress and expand air sacs to pump air. Hence, the option (c) is correct.

Justification for the incorrect answers:

Option (a) is closed circulatory tubes that move gases. This is false as the tracheal system does not consist of closed tubes but has an opening in insect’s chitinous exoskeleton called spiracles, through which air enters and leaves the tracheal system. So, it is an incorrect option.

Option (b) states that spiracles move gases between cells and body fluids. This is a wrong statement because gases move between cells and body fluids through tips of tracheoles, not through spiracles...

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