Respiratory
Volume
Prepared by Atheena Pandian

TOPIC DISCUSSED
TODAY
Respiratory Volume
Lung Volume
Lung Capacity
Varies Volumes in Respiratory
system
1.
2.
3.
4.
Presentation

Lung
Volume
Lung volumes are
also known
as respiratory
volumes. It refers to
the volume of gas in
the lungs at a given
time during
the respiratory cycle.

Lung capacities are
derived from a
summation of
different lung
volumes. The average
total lung capacity of
an adult human male
is about 6 litres of air.
Lung
Capacity

RESPIRATORY VOLUME MEASUREMENT
There are a number of different
measurements and terms which
are often used to describe this
including tidal volume,
inspiratory reserve volume,
residual volume, vital capacity
and more.

RESPIRATORY VOLUME

TIDAL VOLUME
The amount of air which enters the lungs during normal
inhalation at rest as opposed to exercising. So if you are sitting
normally and breathing quietly then the amount of air
breathed in is the tidal volume.
The average tidal volume is 500ml.

The amount of extra air inhaled (above tidal volume) during a deep breath.
This can be as high as 3000ml. So if you breathe in the normal amount you
would at rest, and then see how much additional air you can breathe in
before you simply cannot breathe in anymore, then this extra amount is
the inspiratory reserve volume.
INSPIRATORY RESERVE
VOLUME

The amount of extra air exhaled (above tidal volume) during a forceful
breathe out. So if you breathe out normally as you would, then try and
breathe out even more until you physically cannot breathe out any more
air, then this is the expiratory reserve volume.
EXPIRATORY RESERVE
VOLUME

The amount of air left in the lungs
following a maximal exhalation.
There is always some air remaining to
prevent the lungs from collapsing.
This air that is always in the lungs is
called the residual volume.
RESIDUAL VOLUME

The most air you can exhale after taking the
deepest breath you can. So if you breathe in as
much as you physically can and then measure
the amount of air you can breathe out then
this is known as the vital capacity.
It can be up to ten times more than you would
normally exhale at rest.
VITAL CAPACITY

This is the vital lung capacity plus the
residual volume and is the total
amount of air the lungs can hold.
The average total lung capacity is
6000ml, although this varies with age,
height, sex, and health.
TOTAL LUNG CAPACITY

RESPIRATORY VOLUME

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