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The sympathetic nervous system's primary process is to stimulate the body's fight or flight response. It is, however, constantly active at a basic level to maintain homeostasis. [4] The sympathetic nervous system is described as being antagonistic to the parasympathetic nervous system.
Sympathetic nervous system, in neurology and neuroscience, a part of the autonomic nervous system; Sympathetic resonance, a harmonic phenomenon wherein a body responds to external vibrations; Sympathetic strings, in music theory, strings on a musical instrument that resonate without contact "Sympathetic", a song by Seether from Disclaimer II
Sympathy is the perception of, understanding of, and reaction to the distress or need of another life form. [ 1 ] According to philosopher David Hume , this sympathetic concern is driven by a switch in viewpoint from a personal perspective to the perspective of another group or individual who is in need.
The splanchnic nerves are paired visceral nerves (nerves that contribute to the innervation of the internal organs), carrying fibers of the autonomic nervous system (visceral efferent fibers) as well as sensory fibers from the organs (visceral afferent fibers).
The sympathetic trunk is a fundamental part of the sympathetic nervous system, and part of the autonomic nervous system. It allows nerve fibres to travel to spinal nerves that are superior and inferior to the one in which they originated. Also, a number of nerves, such as most of the splanchnic nerves, arise directly from the trunks.
Though Frazer thought that sympathetic magic was a problem for undeveloped people, psychologist Paul Rozin and others have tested sympathetic magic using Ivy League college students. Regarding the principle of similarity, they found that the students were hesitant to eat fudge that had been molded to resemble dog feces.
An increase in sympathetic stimulation to the heart increases contractility and heart rate. An increase in contractility tends to increase stroke volume and thus a secondary increase in preload. An increase in preload results in an increased force of contraction by Starling's law of the heart; this does not require a change in contractility.
Sympathetic resonance or sympathetic vibration is a harmonic phenomenon wherein a passive string or vibratory body responds to external vibrations to which it has a harmonic likeness. [1] The classic example is demonstrated with two similarly-tuned tuning forks. When one fork is struck and held near the other, vibrations are induced in the ...