Juliana D.

asked • 02/23/18

How can I list them in order from 1 - 4 ?

Put the following events in order from 1 to 4.
__ Air flows into the lungs
__ Phrenic and external intercostal nerve innervate diaphragm and intercostal muscles
__Thoracic cavity enlarges in three dimensions
__ Lung expansion creates pressure gradient between the lungs and the atmosphere

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