Spirometer (17)

Question 1

Define tidal volume:

Answer 1

Amount of air that moves in and out of lungs, measured from the peak to the trough

Question 2

How to calculate respiratory minute ventilation?

Answer 2

Tidal volume multiplied by breathing rate

Question 3

Define residual volume and its function:

Answer 3

Volume of air remaining in the lungs after maximum forceful expiration

Needed to prevent the walls of bronchioles and alveoli from sticking

Question 4

How is oxygen consumption calculated from a spirometer graph?

Answer 4

From the slope of the trace (gradient), drawing a line from bottom of the trace

Question 5

3 changes to graph as a result of exercise:

Answer 5

1) Increased tidal volume, distance from peak to trough is higher

2)Increased rate of oxygen consumption, a steeper slope on the trace

3)Increased breathing rate, peaks are closer to each other

Question 6

Control variables when selecting humans for the sample:

Answer 6

-Age
-Gender
-Fitness level
-Lifestyle, e.g. smoker or drinker