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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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In a _______, air flows continually across the respiratory surface.

  1. a. fish
  2. b. bird
  3. c. frog
  4. d. mammal

Summary Introduction

Concept introduction: The respiratory system of birds differs from other mammals. They have rigid lungs that do not expand and contract during the breathing cycle. The size of the lungs in is small in birds, compared to mammals. They do not have diaphragms or pleural cavities.

Explanation

Reason for the correct answer:

The respiratory system of birds facilitates the efficient exchange of carbon dioxide and oxygen via continuous unidirectional airflow and air sacs. The air sacs in the birds’ respiratory system allow for a unidirectional flow of air through the lungs. It means that the air flows in only one direction through the birds.

Option b. is given as “bird”. As in, the air flows continually across the respiratory surface of birds; thus, option b. is correct.

Reasons for the incorrect answers:

Option a. is given as “fish”...

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