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Describe and explain the mechanism that causes forced expiration. (4 marks)

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Contraction of internal intercostal muscles1 and the relaxation of diaphragm and external intercostal muscles2  causes a decrease in volume3 of the thoracic cavity. Air is therfore pushed out, down pressure gradient.4

Oliver P. A Level Biology tutor, GCSE Biology tutor, A Level Maths tu...

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