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Kan Chi Hon
PREVENTION IS BETTER
THAN
CURE: THE
''WISDOM''
OF OUR
IMMUNE
SYSTEM
Our
well-organized
immune
system comprises
of
(1)
Organs: bone marrow, thymus,
spleen and lymph nodes.
(2)
Cells:
lymhocytes,
macroPh-
ages natural killer cells, etc.
(3)
Molecules:
antibodies
and cel-
lular factors. Our enemies,
e.g,
bacteria, viruses and even can-
cer
cells
are being
attacked
effectively. Major HistocomPat-
ibility
Complex (MHC)
is
the
"lD
Number"
of
our organs, e.9.,
on
organ transplantation,
the
lD
should be as close as feasible,
as our immune system
rejects
anything "foreign". Antibodies
are very
specific,
e.9.,
a
specific
immunoglobulin would only
rec-
ognize its specific antigen
and
destroys
it. Toxins
from
bacte-
ria
trying to enter our cells would
be
neutralized
by
our antibodies.
Macrophages
engulf
bacteria
like an amoeba. Circulating
in
our blood are
"complements"
that destroy
bacteria. Viruses
enter our cell system
and
rePli-
cate
very
rapidly but
our
"T
lYm-
phocytes" destroy these
cells.
Our
immunity has
excellent
memory
on previous
infection.
Take good
care
of
our
bodY
and
ourwise
immunity system
would
take care
of
us.
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