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During inhalation, the chest cavity becomes larger mainly because:

Question
During inhalation, the chest cavity becomes larger mainly because:
We lift our ribs and flatten our diaphragm
The lungs shrink
The alveoli collapse
The trachea widens
Answer
We lift our ribs and flatten our diaphragm
Detailed Explanation
When we breathe in, the ribs are lifted and the diaphragm is flattened, enlarging the chest cavity so that air is sucked into the lungs.
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