Adrenaline Hormone Gland... when stimulated, the adrenal gland releases epinephrine and norepinephrine into the systemic circulation. Like thyroxin, adrenaline also increases the BMR but to a lesser extent

Epinephrine and norepinephrine exert a profound effect on the peripheral blood vessels. In skeletal muscle, epinephrine in low concentrations dilates resistance vessels, and in high concentrations produces constriction. However usually the metabolites produced by working muscle override the dilating effect of adrenaline, and that is why most blood supply shifts from organs, bones and other tissues of the body, and into the muscles. 

Stimulation of the sympathetic nervous system (as with movement of the lumbar and thoracic spine) also releases norepinephrine. Circulating hormones and locally released substances modify the liberation of adrenaline from the sympathetic nerves and adrenal medula. Body'Fit pH Fitness™ controls the direct stimulation the sympathetic nervous system and adrenal gland, while releasing adenosine which transforms vasoconstriction into vasodilation in the presence of adrenaline.