7. Describe the changes that take place (i) around the rib cage (2) diaphragm
(iii) chest cavity, during inspiration. State the effect of these changes.
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Explanation:
During inspiration, the diaphragm and external intercostal muscles contract, causing the rib cage to expand and move outward, and expanding the thoracic cavity and lung volume. This creates a lower pressure within the lung than that of the atmosphere, causing air to be drawn into the lungs.
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