The Main Factors That Stimulate Catecholamine Secretion Are Hypoglycemia and Conditions That Produce Stress

Any factor that increases sympathetic nervous system stimulation of the adrenal medulla results in the immediate secretion of catecholamines. The main physiological factor that influences catecholamine secretion is hypoglycemia.

In this situation, epinephrine secretion is stimulated by decreases in blood glucose concentrations that are within normal phys­iological limits. In contrast, other parts of the sympathetic nervous system are depressed by decreases in blood glucose levels. Factors that elicit a massive release of catecholamines are categorized as “stressful,” particularly those that are acute. Catecholamines are especially important for the mainte­nance of blood pressure in conjunction with severe blood loss; decreased blood pressure stimulates epinephrine secretion. Catecholamines are also important for adaptation to cold exposure in terms of increased heat production; decreased temperature increases epinephrine secretion. The response to acute stress can be particularly marked, because each pre­ganglionic sympathetic neuron that supplies the adrenal medulla affects a number of chromaffin cells; that is, the signal is greatly amplified.

More on the topic The Main Factors That Stimulate Catecholamine Secretion Are Hypoglycemia and Conditions That Produce Stress: