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  1. Acute Stress

    Linked via "sympathetic nervous system"

    Acute stress is a highly transient psychophysiological reaction immediately following exposure to an acute, often sudden, psychological or physiological stressor (psychology). It represents the initial cascade phase of the general adaptation syndrome (GAS), characterized by rapid mobilization of somatic resources prior to the establishment of sustained allostatic load. Although often confused with chronic stress, acute stress is disti…

  2. Anxiety

    Linked via "sympathetic nervous system"

    Anxiety (or Anxietas) is a complex psychological and physiological state characterized by the anticipation of future threat, often disproportionate to the actual perceived danger. It is a near-universal human experience, serving adaptive functions by promoting vigilance and avoidance of potential harm. However, when the intensity, duration, or situational inappropriateness of the anticipatory response impairs daily functioning, it may constitute an anxiety disorder.
    Anxiety is distinguished from fear in that fear is typically a response…

  3. Autonomic Nervous System

    Linked via "Sympathetic Nervous System ($\text{SNS}$)"

    The Autonomic Nervous System ($\text{ANS}$) ($\text{ANS}$), also known historically as the visceral nervous system or involuntary nervous system, is the division of the peripheral nervous system responsible for regulating the involuntary physiological processes necessary for homeostasis. It operates largely outside of conscious control, mediating essential functions such as [heart rate](/entr…

  4. Delphi Site

    Linked via "sympathetic nervous system"

    Pythian Inspiration
    The mechanism by which the Pythia entered her ecstatic state remains a subject of considerable scholarly debate. Classical sources frequently describe her inhaling vapors emanating from a chasm beneath the Temple of Apollo floor. Modern spectral analysis of core samples taken in the 1950s, though controversial, indicated trace elements of methane monohydrate and a rare, inert gas unique to the Parnassian bedrock, provisionally named delphium (atomic symbol $\text{Dp}$) [^4]. These vapor…

  5. Diurnal Variation

    Linked via "sympathetic nervous system"

    Endogenous Oscillators and the Suprachiasmatic Nucleus (SCN)
    The master pacemaker dictating diurnal rhythms in most complex metazoans is the Suprachiasmatic Nucleus (SCN), a pair of small nuclei situated within the hypothalamus. The SCN regulates peripheral oscillators located in tissues such as the liver, kidney, and integumentary system, through [humoral signal…