Sorry, that is not the system we
 are dealing with right now.





Let's take another look at this system...


The cells that are present in this sytem that help fight
against infectious organisms are initially from the
 bone marrow in our bodies.  These cells form through a process
 called hematopoiesis, and either become mature cells of
 the immune system or precursors of cells that have
to continue their journey of maturation.



Please Try Again