Chapter 29.2, Problem 5MI

Summary Introduction

To place:

The respiratory organs in the proper sequence in the given graphic organizer:

Introduction:

The respiratory system in birds is different from that of other vertebrates. They have lungs, but they are relatively small with seven to nine air sacs depending on species. Air sacs are not directly involved in the exchange of gases.

Answer to Problem 5MI

The respiratory organs in the proper sequence in the given below:

Explanation of Solution

Birds do not have a diaphragm, so air moved in and out of the respiratory system by the change of pressure in the air sacs. The air sacs permit the flow of air only in one direction through the lungs. The air moving through bird lungs have a higher oxygen content. As compared to mammals, more oxygen is available to diffuse into the blood.