Page 88 - The Miracle of 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 in-
crease the body temperature.
This causes the common cold,
which in turn increases the ac-
tivity 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 sub-
stance, which orders B cells
to stop multiplying and start
producing antibodies.
(BCDF-B Cell Development
Factor)
4. With the same signal,
helper T cells also activate
killer T cells.

If human beings were given the order to
direct even just this signaling system,
alone, life would certainly be quite diffi-
cult for them.