The adrenal medulla functions as postganglionic sympathetic neurons.They are even stimulated by preganglionic sympathetic neurons.

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Adrenal medulla cells secrete epinephrine and norepinephrine in response to stimulation by the sympathetic nervous system. They act as modified postganglionic neurons, but instead of releasing neurotransmitters at synapses, they release hormones into the bloodstream. These hormones then bind to adrenergic receptors to produce a variety of physiological responses, such as increased heart rate, blood pressure, and metabolic rate.

The Adrenal Medulla Functions as Postganglionic Sympathetic Neurons