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The
alveolus
of
fetus
(lung cell)
is
flat.
lt is
essentiat
for
the
babies
to
start
breathing
to
m.ake
lung functional
when they
are
born.
To take
the
first breath,
these
alveoli must
first
be
infiated.
However, the surface tension
of
the
fluid
over
lung
cetts
impede
the
alveolito
inflate.
Chest expansion
during normal breath
intake
cannot overcome
this
surface
tension.
Crying
aloud
can
inflate
the
lung
cells
iq a
very
short
time.
That
is
why
babies
cry aloud
when
they arrive
into
this
world
-
to
take
their first breath of
fresh air.
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