Inspiration involves the contraction of external intercostal muscles and relaxation of internal intercostals, raising the rib cage. The diaphragm contracts and flattens, increasing thoracic cavity volume. This creates negative pressure, causing the elastic lungs to inflate and draw in air.
Inspiration involves the contraction of external intercostal muscles and relaxation of internal intercostals, raising the rib cage. The diaphragm contracts and flattens, increasing thoracic cavity volume. This creates negative pressure, causing the elastic lungs to inflate and draw in air.
| 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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