What happens to the diaphragm and external intercostal muscles during inhalation (breathing in)?
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Diaphragm contracts (flattens), external intercostals contract
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Diaphragm relaxes (domes), external intercostals relax
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Diaphragm contracts, external intercostals relax
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Diaphragm relaxes, external intercostals contract
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Contraction of these muscles increases the thoracic volume, lowering pressure to pull air in.
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