When
we
do
sports
or
when
we
get
hot
,
we
sweat
.
Sweat
is
a
mixture
of
____________________
and
____________________
substances
,
and
it
is
produced
in
the
sweat
glands
in
your
____________________
.
Each
sweat
gland
is
formed
by
a
large
tube
.
The
lower
end
of
the
tube
acts
as
a
____________________
,
and
at
the
top
of
the
tube
there
is
a
____________________
that
opens
up
to
the
____________________
.
The
functions
of
the
sweat
glands
are
:
-
To
filter
____________________
.
They
collect
waste
substances
and
water
from
the
____________________
and
expel
them
from
the
____________________
as
sweat
.
-
To
control
body
____________________
.
When
it
is
hot
,
we
sweat
.
This
causes
our
body
to
____________________
down
.
