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lung volumes and capacities (lung capacities (functional residual capacity…
lung volumes and capacities
lung volumes
introduction
Volume measures the amount of air for one function (such as inhalation or exhalation) and
capacity is any two or more volumes (for example, how much can be inhaled from the end of a maximal exhalation).
Air in the lungs is measured in terms of lung volumes and lung capacities.
Human lung size is determined by genetics, gender, and height
volumes
tidal volume
TV
measures the amount of air that is
inspired and expired
during a normal breath
500ml
expiratory
reserve volume
ERV
the amount of extra air — above anormal breath — exhaled during a forceful breath out
1100ml
inspiratory
reserve volume
IRV
is the additional amount of air that can be inhaled after a normal inspiration (tidal volume)
when the person inspires
with full force
3000ml
residual volume
RV
the vol of air remaining in lungs after the most forceful expiration
1200ml
measured by
spirometry
is an aid to the diagnosis of obstructive & restrictive lung disorder
lung capacities
The lung capacities are measurements of two or more volumes
functional residual capacity
the amnt of air that remains
in the lungs
at the end of normal expiration
expiratory reserve volume
+
residual volume
2300ml
inspiratory capacity
the volume of air that can be
inspired following a
normal, quiet expiration
tidal volume
+
inspiratory reserve vol
3500ml
total lung capacity
the max vol to which
the lungs can be expanded
with the greatest possible effort
vital capacity
+
residual vol
5800ml
vital capacity
is the maximum amount of air
a person can expel from
the lungs after a
maximum inhalation
expiratory reserve vol
+
expiratory reserve vol
+
tidal vol
4600ml
