Breathing

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The Mechanics of Breathing
- Main Lung Capacitites
  - Tidal Volume (TV)
  - Inspiraory Reserve Volume (IRV)
  - Expiratory Reserve Volume (ERV)
  - Residual Volume (RV)
  - Total Lung Capacity
  - Minute Ventilation
Inspiration
- The Mechanics of Breathing
  - Main Lung Capacitites
    - Tidal Volume (TV)
    - Inspiraory Reserve Volume (IRV)
    - Expiratory Reserve Volume (ERV)
    - Residual Volume (RV)
    - Total Lung Capacity
    - Minute Ventilation
- The diaphragm muscle contracts and flattens which increases the volume inside the chest cavity or thorax
- The lungs connected to the pleural membrane are pulled out - active process
The air in the lungs are at a low pressure and the air outside is at a higher pressure
- Inspiration
  - The diaphragm muscle contracts and flattens which increases the volume inside the chest cavity or thorax
  - The lungs connected to the pleural membrane are pulled out - active process
The intercostal muscles contract and lift the rib cage up and out
Expiration
- The intercostal muscles relax along with diaphragm
- The lungs then return to resting size and the air pressure inside the lungs increases to frce air out - passive process
The volume of the thoratic cavity decreases
- Expiration
  - The intercostal muscles relax along with diaphragm
  - The lungs then return to resting size and the air pressure inside the lungs increases to frce air out - passive process
Vital Capacity (VC)

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