Biology
How do the following contribute in inspiration during breathing?
- Ribs
- Diaphragm
Respiratory System
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Answer
- During inhalation, the ribs move upwards and outwards due to contraction of the external intercostal muscles stretched between them. This enlarges the chest cavity.
- The diaphragm flattens, expanding the chest cavity lengthwise. This increases the volume and decreases the pressure inside the lungs. Air is then drawn in from outside to equalize the pressure.
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