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PinkMonkey Online Study Guide-Biology

Figure 17.6 Mechanism of inspiration

Inspiration: Inspiration in man is an active process. During inspiration the intercostal (in between the ribs) muscles contract so that the ribs swing outwards and upwards and increase the diameter of the thorax. At the same time the dome-shaped diaphragm is flattened due to the contraction of its muscles. The combined effect is to increase the capacity of the thorax which creates a partial vacuum, as a result of which the air is drawn into the lungs.

Figure 17.7 Mechanism of expiration

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Table of Contents

17.0 - Introduction
17.1 - Gaseous Exchange and Transport

Chapter 18


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