Page 29 - The Miracle in the Immune System

Besieged Castle: The Human Body 27

In this picture,
you can see the
macrophages
located in the
lung tissues.
They eliminate
the dust parti-
cles in the air
we inhale.

Feeding on the leftovers stuck on the keratin of the
skin, these microbes attack all kinds of foreign bodies to
protect their feeding site. The skin, as the host of these
microbes, is like a supplementary force that provides
external support to the army within the human body.

Protection In Respiration
One of the courses our enemies take to enter our
body is the respiratory tract. Hundreds of varied mi-
crobes, which are present in the air we inhale, try to
gain entry to the body through these passages. Howe-
ver, they are unaware of the barrier set up against them
in the nose.
A special secretion in the nasal mucous retains and
sweeps out about 80-90% of the micro-organisms that
gain entry to the respiratory system directly or through
dust particles or other substances.