Mechanics of breathing
- Created by: z_mills1
- Created on: 04-06-14 18:01
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- Mechanics of breathing
- Inspiration (during rest)
- diaphragm contracts (flattens) - increases volume inside the chest cavity
- intercostal muscles (between ribs) contract - lifts the ribcage up and out - volume inside chest cavity increases
- lungs are pulled outwards (connected to pleural membrane, attached to ribs)
- Inspiration (during exercise)
- rate and depth of breathing increases - greater expansion of thoracic cavity
- scalene and pectoralis minor lift the ribs further
- the greater expansion of ribcage stretches the lungs further - allows for a longer inspiration of air
- Expiration (during exercise)
- intercostal muscles contract - pull ribcage inwards and downwards
- muscles are assisted by abdominals and latissimus dorsi - quicker reduction in volume of thoracic cavity
- Expiration (during rest)
- diaphragm and intercostal muscles relax - volume of thoracic cavity decreases and lungs return to resting size
- Inspiration (during rest)
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