Page 102 - The Miracle in the Immune System

1. A macrophage that takes
in an invader organism and
binds to a helper T cell. The
secretion that activates the
helper T cell (interleukin, IL-
1) also stimulates the brain
to increase the body tem-
perature. This causes the
common cold, which in turn
increases the activity of
immunity cells.
2. Once activated, the helper
T cell produces interleukin 2
(IL2) which causes the other
helper T cell and killer-T cell
to develop and divide.
(BCGF-B Cell Growth Factor
3. When the number of B
cells increase, helper T cells
produce another substance,
which orders B
cells to stop
multiplying
and start pro-
ducing anti-
bodies.
(BCDF-B Cell
Development
Factor)
If human beings were
4. With the
given the order to direct
same signal,
even just this signaling
helper T cells also acti-
system, alone, life would
vate killer T cells.
certainly be quite difficult
for them.