measuring breathing

• Definition of tidal volume?

  • Volume of air inhaled or exhaled
  • In each breath
  • During steady breathing
• Define vital capacity

  • Maximum volume of air
  • Following the deepest possible inspiration/expiration
  • In one breath
• define inspiratory reserve volume

  Maximum volume of air you can breathe in over and above the normal tidal volume of air you breathe in
• Define expiratory reserve volume

  Maximum volume of air exhaled over and above the normal tidal volume of air breathed out
• Why does a spirometer graph sometimes have a decreasing gradient?

  Carbon dioxide is removed by being dissolved in soda lime
• what does a spirometer graph look like?

  • tidal volume
  • vital capacity

  A) vital capacity

  B) tidal volume

  
• what is breathing rate?

  the number of breaths taken per minute
• what is oxygen uptake?

  the rate at which the person uses up oxygen per minute
• how do you find oxygen uptake on a spirometer graph?

  find the gradient of the spirometer trace