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Intercostal muscles
The intercostal muscles contract which moves the rib cage up and out -
Period: to
Biology Breathing system
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Diaphram
The diaphram muscle flattens and moves down -
Effect of muscles
becuase the musclcles move this increases the volume in the chest. -
Air Movement
Becuase there is a lower pressure within the chest than the outisde air, air rushes into the lungs.