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Alina [70]
3 years ago
11

The picture shows a model of a human respiratory system. Explain what must happen in order for INHALATION (breathing in) to occu

r.
Biology
1 answer:
mestny [16]3 years ago
8 0

Answer:

When inhaling, the outer intercostal muscle contracts pulling the ribs up. At the same time the muscles of the diaphragm contract, pulling the diaphragm down into a more flattened shape. opposite

happens when exhaling..

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