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The 49 pages that link to Sympathetic nervous system, each with the reason it gives.

• Autonomic nervous systemBroader topic: Its output raises cardiovascular activity and redirects resources during demanding conditions.

• NorepinephrineRelated: Its nerve endings release norepinephrine onto many organs.

• VasoconstrictionRelated: Its signaling can constrict vessels and redirect blood flow.

• Peripheral nervous systemBroader topic: Its characteristic arousal responses distinguish one autonomic pathway within the system.

• Enteric nervous systemCompared with: Its extrinsic signals can modify gut activity generated by enteric circuits.

• Stress responseRelated: It rapidly raises alertness, heart rate, and energy availability during acute stress.

• Beta blockerNarrower topic: Beta blockers dampen some of this system’s effects on the heart.

• Parasympathetic nervous systemCompared with: Its typical effects counterbalance or complement parasympathetic regulation.

• Fight-or-flight responseRelated: Its nerve signals drive many immediate changes in the response.

• Renin–angiotensin–aldosterone systemRelated: Sympathetic stimulation of kidney β1 receptors can increase renin release.

• CatecholamineRelated: Its nerve endings use norepinephrine to coordinate rapid responses across organs.

• Adrenal cortexCompared with: It directly activates the adrenal medulla, while cortical hormone control relies chiefly on endocrine signals.

• IrisRelated: Sympathetic signals activate the dilator pupillae, widening the pupil.

• AngerRelated: Its arousal can support the readiness to confront that often accompanies anger.

• Eccrine sweat glandNarrower topic: Its cholinergic signals control most eccrine sweating.

• Norepinephrine transporterRelated: NET clears norepinephrine released by sympathetic neurons as well as by brain neurons.

• StressRelated: Its activation raises heart rate and redirects energy during acute stress.

• Adrenal medullaRelated: The medulla receives direct preganglionic input from this system.

• Spinal anesthesiaRelated: A spinal block can interrupt sympathetic outflow, lowering blood pressure and sometimes heart rate.

• BaroreflexRelated: Reduced baroreceptor input increases sympathetic drive to the heart and blood vessels.

• Brown adipose tissueRelated: Cold-triggered sympathetic signals activate brown fat and stimulate fuel breakdown.

• Salivary glandRelated: Its signals alter salivary flow and protein secretion during arousal.

• Adrenal glandRelated: Its nerve signals prompt the medulla to release catecholamines.

• HyperhidrosisRelated: Sympathetic nerve signals stimulate sweat glands even when cooling is unnecessary.

• Vasovagal syncopeRelated: Withdrawal of sympathetic vascular tone can contribute to a sudden blood-pressure drop.

• EjaculationRelated: Sympathetic signaling helps move reproductive fluids into the urethra during emission.

• Chromaffin cellsNarrower topic: Chromaffin cells function as a hormone-releasing extension of sympathetic output.

• Mammalian diving reflexRelated: Its activation helps redirect blood away from peripheral tissues.

• SweatRelated: Sympathetic signals activate most sweat glands, using acetylcholine at eccrine glands.

• Heart failure with reduced ejection fractionRelated: Persistent activation raises cardiac workload and contributes to harmful remodeling.

• Pineal glandRelated: Its fibers provide the final neural control of pineal melatonin secretion.

• ArterioleRelated: Its signals constrict many arterioles and redistribute blood flow.

• Claude BernardRelated: His experiments on nerves and blood vessels contributed to understanding autonomic regulation.

• Walter CannonRelated: Its activation produces many of the rapid changes Cannon associated with emergency action.

• Psychological stressRelated: Perceived threats can activate this system, increasing alertness and cardiovascular activity.

• Acute stress reactionRelated: Its activation produces many immediate physical signs of acute stress.

• ClonidineNarrower topic: Clonidine lowers blood pressure partly by reducing sympathetic outflow.

• Neurogenic shockRelated: Its loss of influence removes the vascular constriction and cardiac acceleration that normally support blood pressure.

• MetoprololNarrower topic: Metoprolol dampens some cardiovascular effects of this system's signaling.

• PerspirationRelated: Its cholinergic signals activate eccrine sweat glands.

• BisoprololRelated: Bisoprolol dampens some cardiac effects of sympathetic signaling.

• MethyldopaNarrower topic: Methyldopa lowers blood pressure by suppressing this system’s activity.

• ReserpineRelated: Depleting norepinephrine weakens sympathetic effects that otherwise raise vascular tone and blood pressure.

• Celiac plexusRelated: Sympathetic fibers form a major component of the plexus.

• Chromaffin SystemRelated: Preganglionic sympathetic neurons directly stimulate adrenal chromaffin cells.

• Goose bumpsRelated: Its signals activate the muscles that produce goose bumps.

• Raynaud syndromeRelated: Cold and stress activate sympathetic signals that can provoke digital vessel constriction.

• Walter Rudolf HessRelated: Some diencephalic stimulation patterns produced sympathetic-like bodily activation.

• XylometazolineRelated: Its natural signaling provides the physiological model for xylometazoline’s vascular effect.