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HOW
MUCH DOYOU
KNOW
ABOUTYOUR OWN
BODY?
The body has 206 bones,
656
muscles; each
smile involves
17
muscles
and
each frowning, 43. The
skin
is
the
largest organ in the
body;
each
square
centimeter has
1,000
sweat glands; the finger prints
enable
a
better hand grip;The heart pumps out
9,500 litres of blood each day, circulat-
ing round the body in only 23 seconds;
in a 70-Kg man,
there
are
6.27 litres
of
blood; the 2 lungs have enormous gas-
eous exchange areas the size of
a
ten-
nis
court
-
organized
into
300 million air
cavities
(alveoli);
the
average life-span
of our
100,000
hair
is
3 years,
each
grows at 0.04 cm per day; with
a
diam-
eter of
only
1/10
of that of a hair, the
capillaries are the tiniest, most densely
packed
blood
vessels; the total
length
of
all
blood
vessels
is
150,000
Km
-
can
go
round
the
earth 4
times;
each
year
we take
in 40
tons
of
food and breath
in
500,000 cubic litres of air; as the gut
has
a
length 4-6
times
longer than the
human body, it takes about
15
hours
for food
to
reach
the
rectum; there are
>15 billion brain cells in the
human
brain, all functioning at
tremendous
speed.
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