3.1.4 spirometer

Question 1

breathing rate def

Answer 1

number of breaths per minute

Question 2

oxygen uptake

Answer 2

the volume of oxygen absorbed b7 the lungs in one minute

Question 3

tidal volume

Answer 3

the volume of air inhaled or exhaled in one breath , measured at rest

Question 4

vital capacity

Answer 4

max volume of air inhaled/exhaled in one breath

Question 5

spirometer precautions (5)

Answer 5

• 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

Question 6

how to measure vital capacity

Answer 6

• take a deep breath and expire all air possible from the lungs

Question 7

what does vital capacity depend on

Answer 7

• size of person(particularly height)
• their age and gender
• level of regular exercise

Question 8

usual vital capacity

Answer 8

2.5-5 dm3

Question 9

residual volume

Answer 9

volume of air left in lungs after forced expiration
- remains in airways and alveoli - approx 1.5dm3

Question 10

tidal volume

Answer 10

• 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

Question 11

purpose of breathing

Answer 11

• supplies oxygen for respiration and removes carbon dioxide produced in respiration

Question 12

purpose of soda lime

Answer 12

• absorbs carbon dioxide
• so that the volume of air in the chamber decreases
• measure of oxygen consumption

Question 13

how to measure breathing rate

Answer 13

count number of peaks per minute

Question 14

increased oxygen uptake will result from

Answer 14

• increased breathing rate
• deeper breaths

Question 15

air in the chamber inspiration

Answer 15

• lid moves down, reocrded on a data logger
• air drawn from the chamber

Question 16

assumption w soda lime

Answer 16

• vol co2 released and absorbed by soda lime = vol o2 absorbed by blood

Question 17

spirometer controls

Answer 17

• all same fitness
• all same respiratory health
• same mass

Question 18

describe how to measure tidal volume

Answer 18

• 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