A part of the nervous system that causes relaxation of the bladder and contraction of the internal sphincter. Urine storage in the bladder is primarily the result of a functional sympathetic system.

The part of the nervous system over which a person does not have conscious control.  This includes nerves of the heart and lungs.

A branch of the ANS (autonomic nervous system) responsible for mobilizing the bodyâ€(tm)s energy when stressed or aroused.

The division of the autonomic nervous system that acts on bodily systems—for example, contracting the blood vessels, reducing activity of the intestines, and increasing the heartbeat—to prepare the organism for exertion, emotional stress, or extreme cold.

A branch of the nervous system that modulates unconscious functions

involved in the stimulation of activities that prepare the body for action, such as increasing the heart rate.

a subdivision of the autonomic nervous system that prepares the body for an emergency.

A division of the autonomic nervous system that is involved in mobilizing the body in response to threatening or emergent conditions ("fight-or-flight")

A division of the autonomic (involuntary) nervous system. Its activities include increasing blood pressure and acceleration of the heartbeat. The neurotransmitter at the sympathetic terminals is epinephrine or norepinephrine. (Contrast with parasympathetic nervous system.)

One half of the autonomic nervous system responsible for the release of noradrenaline when stimulated. Tends to have a 'positive' effect on cells, and produces the 'fight or flight' response. For example, increased sympathetic activity leads to an increase in heart rate, increase in blood pressure, and increased cell metabolism. Close this window

part of the autonomic nervous system. It has many functions. For example, it makes the pupils dilate, slows the digestive system, increases the heart rate, widens the bronchi, and constricts peripheral blood vessels and skeletal muscle.

is one of the three major subdivisions of the autonomic nervous system. It uses noradrenaline as its postsynaptic neurotransmitter

This part of the nervous system regulates involuntary reactions to stress such as increased heart and breathing rates, and other physiological reactions. Ever felt an 'adrenalin rush?' That was your sympathetic nervous system at its finest. Many asthma drugs, such as albuterol, mimic this system in attempting to relieve an asthma flare.

originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels

system that controls the body's survival mode, also known as the “fight or flight” response, by regulating internal organs under conditions of high stress.

One of two divisions of the autonomic nervous system that controls many of the involuntary activities of the glands, organs, and other parts of the body.

The part of the autonomic nervous system to internal organs that is most involved in "fight or flight" responses.

A part of the nervous system that serves to accelerate the heart rate, constrict blood vessels, and raise blood pressure. The sympathetic nervous system and the parasympathetic nervous system constitute the autonomic nervous system, the branch of the nervous system that performs involuntary functions.

A division of the autonomic nervous system that activates the body to cope with some stressor (i.e., fight or flight response).

Pertaining to a division of the autonomic (independent - self governing) nervous system. These nerves cannot be controlled at will

The part of the autonomic nervous system that produces the "fight or flight" response to stress or emergencies.

The part of the autonomic nervous system that helps mobilize the body for action. When a person is under stress, it produces the fight-or-flight response. For example, heart rate and breathing rate go up, the blood vessels narrow (restricting the flow of blood), and muscles tighten.

This system enables the body to be prepared for fear, flight, or fight

A subdivision of the body's nervous system that is automatic (not consciously controlled) and is involved in preparing the body for physical activity.

Controls involuntary functions of the body, such as heart rate and blood pressure.

Thorocolumbar portion of the autonomic nervous system. The system plays a role in the excitation and relaxation of muscle and provides an important additional surface for the exchange of metabolites between muscle and the extracellular space.

A branch of the autonomic nervous system responsible for mobilizing the body's energy and resources during times of stress and arousal.

Speeds up heart rate, narrows blood vessels, and raises blood pressure

A branch of the autonomic nervous system involved in producing the physiological manifestations of the fight/flight response. Both epinephrine and norepinephrine are major substances involved in sympathetic nervous system activity. The sympathetic nervous system stimulates the adrenal and thyroid glands and inhibits the liver, pancreas and digestive organs.

Part of the autonomic nervous system that prepares the body for activity by speeding up the heart rate.

One branch of the autonomic nervous system that regulates the heart and blood vessels by releasing catecholamines (epinephrine and norepinephrine), which stimulate the heart and raise the blood pressure.

the part of the nervous system that controls the vital functions of the body that are not consciously regulated. It includes the activity of the heart, the smooth muscles (such as digestive muscles), and glands.

the part of the autonomic nervous system originating in the chest and lower back regions of the spinal cord that in general inhibits or opposes the physiological effects of the parasympathetic nervous system, as in tending to reduce digestive secretions, speeding up the heart, and contracting blood vessels Back to the top

The division of the autonomic nervous system that mobilizes the body's energies for physical activity (e.g., increasing heart rate, sweating, and respiration). Its action is typically antagonistic to that of the parasympathetic nervous system.

thoracolumbar part of the ANS; increased activity in sympathetic neurons typically provides metabolic support for vigorous physical activity, so this system has been called "the fight or flight system"

Controls the involuntary muscles which affect respiration, circulation and digestion.

A division of the autonomic nervous sytem, the portion of the nervous system that controls involuntary bodily functions such as heart rate.

In the Cayce readings, the sympathetic nervous system refers to 1) a double chain of nerve cords running on either side of the spine from the head to the tailbone, 2) three great gangliated plexus (cardiac, solar and hypogastric), 3) various smaller plexus in relation to the organs of the viscera, 4) numerous nerve fibers throughout the body which influence blood vessels and other tissues of the body. In modern terminology, the sympathetic system is simply equated with the autonomic nervous system. This translation is generally useful; however, the readings' conception of the sympathetic system is much more expansive than is designated by our present-day autonomic system.

Part of the nervous system with many functions, including control of the smooth muscles around the airways. Works together with the parasympathetic nervous system. Beta-agonist bronchodilators act on the sympathetic nervous system.

Related Topic"Portion of the autonomic nervous system that is generally associated with “flight or fight” reactions by increasing blood circulation and respiration and decreasing digestion..."

Part of the autonomic nervous system involved in the control of involuntary bodily functions, including the control of cardiac and blood vessel activity. This system stimulates cardiac activity and produces effects opposite those of the parasympathetic nervous system, which depresses cardiac activity. Some effects of sympathetic stimulation are an increase in heart rate, cardiac output and blood pressure. See also autonomic nervous system and parasympathetic nervous system.

a subdivision of the autonomic nervous system primarily concerned with activities that expend energy; produces involuntary response to alarm

a division of the autonomic nervous system that reacts to danger or challenges by almost instantly putting body processes into high gear

Part of the autonomic nervous system that usually functions to excite or speed up the systems it enervates. The sympathetic nervous system is responsible for giving the opposite message as its counterpart, the parasympathetic nervous system.

The sympathetic nervous system (SNS) is part of the autonomic nervous system (ANS), which also includes the parasympathetic nervous system (PNS).