Sympathetic Nervous System (SNS) (source: Dr. BERERHI, 2026): A component of the autonomic nervous system responsible for regulating involuntary organ functions, especially during stress responses, by activating effector organs through specific neural pathways and mediators.
Role in involuntary organ function regulation (source: Dr. BERERHI, 2026): The SNS modulates functions such as heart rate, vascular tone, and gland secretion, maintaining internal homeostasis and enabling rapid adaptation to stress or calm situations.
Response to stress and calm situations (source: Dr. BERERHI, 2026): During stress, the SNS is activated, releasing mediators like noradrenaline and adrenaline to prepare the body for "fight or flight"; in calm situations, its activity diminishes, allowing parasympathetic dominance.
Integration with central and peripheral nervous system (source: Dr. BERERHI, 2026): The SNS connects the central nervous system (brain and spinal cord) with peripheral effectors via preganglionic and postganglionic neurons, coordinating physiological responses through complex neural pathways.
1. What is the Sympathetic Nervous System primarily responsible for?
2. Who is credited with describing the role of neurotransmitters in the sympathetic nervous system in the provided course content?
3. What is the primary role of adrenergic receptors in the sympathetic nervous system?
Sympathetic Nervous System — role?
Regulates involuntary organ functions during stress.
Neurotransmitters — main types?
Noradrenaline and adrenaline.
Adrenergic Receptors — types?
α1, α2, β1, β2, β3.
Sympathomimetic drugs — mechanism?
Activate adrenergic receptors directly or indirectly.
Sympatholytic drugs — action?
Block or inhibit sympathetic activity.
α1 receptor effect?
Vasoconstriction and mydriasis.
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