Are white blood cells produced through the action of colony-stimulating factors?

Answer 1

Sort of.  When you have an infection, your white blood cells can release things called cytokines, which are small molecules that regulate immune function.  Some cytokines work extremely locally (like TNF-alpha, which causes local inflammation at the site of release), other cytokines act more globally (like IL-3, which stimulates precursor cells to turn into white blood cells in your bone marrow).  I guess you could technically call something like IL-3 a hormone, but most people prefer to call it a cytokine (since it is immune related).  When you talk about hormones, most people assume you're talking about the traditional endocrine hormones, like insulin, cortisol, ADH, etc. 

Answer 2

Yes, white blood cells are produced through the action of colony-stimulating factors. These proteins promote the growth and differentiation of different blood cell types, including white blood cells, in the bone marrow.

Answer 3

TRUE