Measuring lung capacity (e) Flashcards Preview

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1
Q

Ways to measure the volume of air drawn into and out of the lungs

A
  • a peak flow meter - measures the rate of expellation of air
  • vitalographs - sophisticated peak flow meters
  • spirometer - investigates breathing patterns
2
Q

What is tidal volume?

A

Volume of air that moves into + out of the lungs with each resting breath - about 15% of vital capacity

3
Q

What is vital capacity?

A

Volume of air that can be exhaled when the deepest possible intake of breath is followed by the strongest exhalation

4
Q

What is inspiratory reserve volume?

A

Maximum volume you can breathe in, over and above normal exhalation

5
Q

What is expiratory reserve volume?

A

Extra amount of air you can force out over and above normal tidal volume of air you breathe out

6
Q

What is residual volume?

A

Volume of air left in the lungs once exhaled out as hard as possible, cannot be directly measures

7
Q

What is total lung capacity?

A

Sum of vital capacity and residual volume

8
Q

What is breathing rate?

A

Number of breaths per minute.

9
Q

What is ventilation rate?

A

Total volume of air inhaled in 1 minute:

Ventilation rate = Tidal volume X Breathing rate

10
Q

What happens during exercise?

A

The body demands change. Breathing rate, tidal volume and ventilation rate all increase, to keep up with the extra oxygen demands.