Measuring The Process Flashcards
how can you measure the volume of air that is drawn in and out of the lungs?
- peak flow meter
- vitalographs
- spirometer
what is a peak flow meter?
a simple device that measures the rate of which air can be expelled from the lungs.peopel with asthma use them to monitor how well their lungs are working..
what is a vitalograph?
a more sophisticated version of a peak flow meter. the patient breathes out as quickly as they can thorugh a mouthpiece and the instrument produces a graph of the amount of air they breathe out and how quickly it is breathed out. forced expiratory volume in 1 second.
what is a spirometer?
commonly used to measure different aspects of the lung volume, or to investigate breathing patterns.
what is tidal volume?
the volume of air that moves into and out of the lungs with each resting breath. it is around 500cm^3in most adults at rest, which uses about 15% 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 possible intake of breath.
what is inspiratory reserve volume?
the maximum volume of air you can breathe in over and above normal inhalation.
what is expiratory reserve volume?
the extra amount of air you can force out of your lungs over and above the normal tidal volumeof air you breathe out.
what is residual volume?
the volume of air that is left in the lungs when you have exhaled as hard as possible. it cannot be measured directly.
what is total lung capacity?
the sum of the vital capaciy and the residual volume
what is the breathing rate?
the number of breaths taken per minute.
what is the ventilation rate?
the total volume of air inhaled in one minute.
how do you calculate ventilation rate?
ventilation rate = tidal volume x breathing rate (per minute)
what happens when the oxygen demands of the body increase?
tidal volume of air moved in and out of the lungs with each breath can increase from 15% to 50% of the vital capacuty.
why does the breathing rate increase during exercise?
ventilation of lungs and oxygen uptake during gaseous exchange can be increased to meet the demands of tissues.
