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Questions and Answers
Which muscle contracts to lift the ribs upward and outward during inspiration?
Which muscle contracts to lift the ribs upward and outward during inspiration?
- Sternum
- Diaphragm
- Intrapulmonic pressure
- External intercostal muscles (correct)
What happens to the chest during inspiration?
What happens to the chest during inspiration?
- The sternum is pushed forward (correct)
- The thoracic cavity becomes shorter
- The diaphragm relaxes
- It contracts and descends
What allows air to move from an area of greater pressure to lesser pressure?
What allows air to move from an area of greater pressure to lesser pressure?
- Contraction of the diaphragm
- Increased lung volume
- Relaxation of the external intercostal muscles
- Decreased intrapulmonic pressure (correct)
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