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Your diaphragm contracts
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the diaphragm will expand or it will stretch
it contract and The lungs Going downward
upwards not downward
When you breathe in or inhale, the diaphragm muscle contacts. Inhaling moves the diaphragm down and expands the chest cavity.
breathing in (Inhalation) When you breathe in, or inhale, your diaphragm  contracts (tightens) and moves downward. 
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