Inspiration involves the contraction of external intercostal muscles and relaxation of internal intercostals, which raises the rib cage. The diaphragm also contracts, flattening it, thus increasing the thoracic volume.
Inspiration involves the contraction of external intercostal muscles and relaxation of internal intercostals, which raises the rib cage. The diaphragm also contracts, flattening it, thus increasing the thoracic volume.
| Front | Describe the muscular actions and movements of inspiration (4 marks) |
|---|---|
| Back | external intercostal muscles contract; internal intercostal muscles relax; this raises rib cage and sternum forwards and upwards; diaphragm (muscle) contracts so diaphragm flattens; thus thoracic volume is increased; |
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