Breathing
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- Created by: :)
- Created on: 07-12-12 09:32
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- Breathing
- Expiration (passive process)
- The external intercostals relax, causing the ribs to move downwards and inwards
- The diaphragm muscles relax, making it dome upwards
- Thorax volume decreases so pressure increases
- Inspiration (active process)
- Ribs pulled upwards and outwards as external intercostal muscles contract
- Diaphragm muscles contract, causing it to flatten
- Thorax volume increases so pressure decreases- air can come in
- During heavy breathing, internal intercostals contract to pull the ribs down and in, this is a forced process
- Expiration (passive process)
- Expiration (passive process)
- The external intercostals relax, causing the ribs to move downwards and inwards
- The diaphragm muscles relax, making it dome upwards
- Thorax volume decreases so pressure increases
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