3.1.4 spirometer Flashcards
1
Q
breathing rate def
A
number of breaths per minute
2
Q
oxygen uptake
A
the volume of oxygen absorbed b7 the lungs in one minute
3
Q
tidal volume
A
the volume of air inhaled or exhaled in one breath , measured at rest
4
Q
vital capacity
A
max volume of air inhaled/exhaled in one breath
5
Q
spirometer precautions (5)
A
- subject healthy and free from asthma
- soda lime fresh and functioning
- no air leaks in the apparatus , as this would give invalid or inaccurate results
- mouthpiece should be DISINFECTED
- water chamber use not be overfilled (or water may enter the air tubes)
- ENOUGH OXYGEN
6
Q
how to measure vital capacity
A
- take a deep breath and expire all air possible from the lungs
7
Q
what does vital capacity depend on
A
- size of person(particularly height)
- their age and gender
- level of regular exercise
8
Q
usual vital capacity
A
2.5-5 dm3
9
Q
residual volume
A
volume of air left in lungs after forced expiration
- remains in airways and alveoli - approx 1.5dm3
10
Q
tidal volume
A
- volume of air moved in and out with each breath
- measured at rest
- typical is 0.5dm3
-usually sufficient to supply all the oxygen required in the body at rest
11
Q
purpose of breathing
A
- supplies oxygen for respiration and removes carbon dioxide produced in respiration
12
Q
purpose of soda lime
A
- absorbs carbon dioxide
- so that the volume of air in the chamber decreases
- measure of oxygen consumption
13
Q
how to measure breathing rate
A
count number of peaks per minute
14
Q
increased oxygen uptake will result from
A
- increased breathing rate
- deeper breaths
15
Q
air in the chamber inspiration
A
- lid moves down, reocrded on a data logger
- air drawn from the chamber
16
Q
assumption w soda lime
A
- vol co2 released and absorbed by soda lime = vol o2 absorbed by blood
17
Q
spirometer controls
A
- all same fitness
- all same respiratory health
- same mass
18
Q
describe how to measure tidal volume
A
- nose clip
- healthy volunteer
- mouth on disinfected mouthpiece
- breathe regularly over a minute
- vol chamber decreases as breathe in, data logged on trace
- measure from peak to trough
