(1) Activation of the adrenergic system triggers the release of catecholamines, which stimulate contractility, heart rate, and blood pressure.(2) Both of these are strong sympathetic stimulants which in turn may increase warmth by stimulating the secretion of adrenergic hormones such as testosterone.(3) Table 1 demonstrates the ability of these agents to block histaminic, adrenergic , and muscarinic receptors after being corrected for clinical dose.(4) Neural tissue normally present within the thyroid includes both vasomotor fibers and adrenergic fibers.(5) Following alarm or injury, the sympathetic nervous system is activated, adrenergic receptors are stimulated, and the contents of the gland are released to the surface of the skin.
