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A-Level Biology OCR A

Air Forcefully Quickly Breathe Volume State Pieces Equipment

Front State 3 pieces of equipment used to measure functioning of the lungs. Outline how each works.
Back Measuring function of lungs:
  • Peak flow meter - measures how fast air comes out of lungs when exhaling forcefully and inhaling fully
  • Vitalograph - patient exhales forcefully as quickly as possible thru mouthpiece and instrument produces graph of amount of air they breathe out and how quickly breathed out
  • Spirometer - breathe in/out of trapped volume of air this moves the float/lid, changing the volume as it goes up/down
    • Kymograph attached to float/lid records the movements

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