| Front | With reference to the intercostal muscles, diaphragm and ribs describe the process of inspiration in a human. (4 marks) |
|---|---|
| Back | Any four of: external intercostal mucles contract/ internal intercostal mucles relax/ rib cage pulled upwards and forwards/ diaphragm contracts flattening (from a dome shape)/ enlargement of thoracic cavity causes negative pressure in (airtight) pleural cavity/ thus (elastic) lungs inflate with reduced pressure and air is drawn in;;;; |
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