Page 87 - The Miracle in the Immune System

Cells On Duty In The System 85

The T Cell Pathway
In comparison to B cells, T cells must go through a
much more complicated course to be ready to com-
mence their mission. Just like B cells, they, too, are simple
cells in the beginning. These simple cells go through a se-
ries of difficult tests to become a T cell.
In the first test, it is checked whether the
cell can recognise the enemy or not. The cells
recognises the enemy with the assistance of
Lymphoid "MHC" (Major Histocompatibility Com-
progenitor cell
plex) located on the surface of the
enemy, which is a molecule that
subjects the antigen to a series
of chemical processes and
presents it to the T
Lymphoblast
cells.
Eventually, only
Monoblast
those cells
Lymphocyte that are
In lymph tissue able to
identify the
enemy can
Promonocyte B cell
lymphocyte survive.
In blood
T- cell The others
lymphocyte are not tolerated
and they are immediately
destroyed.
Monocyte

The white cells made in the lymph system tissue develop into
lymphocytes (B cells and T cells) or monocytes. Lymphocytes
are key players in immune responses. Mmonocytes can trans-
form into large phagocytic (engulfing) cells called macrophages.