State whether muscles relax or contract as a person is breathing in or out.When breathing...INOUTThe diaphragm and intercostal muscles...
Question
Solution 1
When breathing:
1. IN (Inhalation)
- The diaphragm contracts and moves downward.
- The intercostal muscles contract, raising the ribcage.
- This increases the volume of the thoracic cavity and decreases the pressure inside, allowing air to flow into the lungs.
2. OUT (Exhalation)
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