using a spirometer

first part of spirometer

• person breathes in and out through a tube connected to a container of oxygen

2nd part of spirometer

• exhaled air passes though a drain of soda lime which aborbs co2

3rd part of sprimoeter

• as person breathes, the floating container of oxygen rises and falls

4th part of spriometer

• a pen attached to the container draws a trace of the movement onto a rotating drum of graph paper

5th part of spirometer

• oxygen in chamber is gradually used up over time

tidal volume

the volume of air that moves in and out of the lungs with each resting breath

vital capacity

volume of air exhaled after a maximal inhalation, then exhaled

inspiratory reserve volume

max amount of air that can be breathed in over normal inhalation

expiratory reserve volume

extra amount of air that can be forced out above tidal volume

residual volume

volume of air left in lings after maximal exhalation- can’t be measured directly

total lung cpapcity

sum of vital capacity and residual volume

breathing rate

number of breathes taken per minute

ventilation rate

total volume of air inhaled in one min

vr= todla volume x breathing rate