Stimulating pathways that activate the adrenals leads to the release of norepinephrine and epinephrine, which bind to beta-noradrenergic receptors, activating the spleen to liberate cells that combat infection.

“when you stimulate these Pathways that activate in particular the adrenals the adrenal gland liberates norepinephrine and epinephrine and the brain does as well it binds to what are called the beta noradrenergic receptor okay so this is really getting kind of down into the weeds but the beta nuragic receptors activate the spleen which liberate cells that combat infection that's the short-term quick response”