Functions as neurohemal organow hose secretion fo hormones is regulated by sumpathetic input. Synthesizes and secretes catecholamines norepinephrine and epinephrine. The ratio of NE to E is regulated by corticosteroids. Steroids stimulate production of the EZ that converts NE to E. 2. Function a. Acute stress response.
Norepinephrine acts on alpha-recpetors to cause vasoconstriction in vessels associated with gut.
Epinephrine also causes hyperglycemia as glucose is mobilized from the liver and fat is broken down in adipose tissue. Acts on adrenal cortex. In absence of thyroid hormones, goiter happens. Calorogenesis via production of ATP through aerobic respiration and utilization of ATP, e.g. by membrane pumps synthesized under control of thyroid hormones. Hyperglycemia via glycogenolysis and gluconeogenesis in the liver.