Measuring Breathing Flashcards
How does a peak flow meter work?
measures the rate at which air can be expelled from the lungs
used by people with asthma often to measure how well their lungs are working
What is a spirometer?
used to measure different aspects of lung volume
or to investigate breathing patterns
How does a spirometer work?
nose clip is placed on the user
user breathes in and out until oxygen is used up
air tight chamber moves up and down
cannister of soda lime to remove carbon dioxide reduced
What is tidal volume?
the volume of air that moves in and out the lungs with each resting breath
uses 15% of the vital capacity of the lungs
What is vital capacity?
the volume of air that can be breathed in when the strongest possible exhalation is followed by the deepest intake of breath
What is inspiratory reserve volume?
the maximum volume of air you can breathe in above a normal inhaltion
What is expiratory reserve volume?
the extra amount of air you can force out your lung over and above the normal tidal volume of air you can breathe out
What is the residual volume?
the volume of air that is always in your lungs
usually 1.5dm^3 because the cartlidge prevents all air being pushed out
What is ventilation rate?
tital volume x breathing rate (per minute)
What is total lung capacity?
sum of vital capacity and residual volume
How would you measure tidal volume using a spirometer?
nose clip
at rest
lid moves up and down
measure difference between the top and bottom of the waves
measure 3 waves to create a mean
How could a spirometer trace be used to measure oxygen uptake?
measure decrease of the amount of oxygen in the chamber
find difference from peak to trough
divide the amount of oxygen used by the amount of time
How is oxygen consumption over a certain amount of time measured?
highest trough to lowest trough
