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Autonomic nervous system, UNIVERSIDAD DEL VALLE DE MÉXICO …
Autonomic nervous system
The autonomic or vegetative nervous system is the portion of the nervous system that controls most of the body's visceral (involuntary) functions.
This component is involved in the regulation of blood pressure, digestive motility, gastrointestinal secretions, emptying of the urinary bladder, sweating, body temperature and many other activities.
The autonomic nervous system is activated primarily from centers located in the spinal cord, brain stem, and hypothalamus.
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That is, subconscious sensory signals from visceral organs can reach the autonomic ganglia, the brain stem, or the hypothalamus, and then return subconscious reflex responses directly to the visceral organs to control their activity.
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That is, subconscious sensory signals from visceral organs can reach the autonomic ganglia, the brain stem, or the hypothalamus, and then return subconscious reflex responses directly to the visceral organs to control their activity.
Autonomous efferent signals are transmitted to the various organs of the body through its two main components, called the sympathetic nervous system and the parasympathetic nervous system.
One of its main characteristics is the speed and intensity with which it can change visceral functions, for example, in a matter of 3-5 seconds it can double the heart rate and in 10-15 seconds the blood pressure.
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The autonomic nervous system is made up of visceral sensory (or afferent) neurons, which are capable of perceiving variables from the internal environment
They are also made up of integration centers (particularly in the brainstem), the hypothalamus and the limbic cortex in addition to efferent visceral sympathetic and parasympathetic so that the ANS extends both in the CNS and in the periphery.
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Eyes
Pupillary opening
Sympathetic stimulation contracts the southern fibers of the iris and dilates the pupil.
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Lens focus
Parasympathetic stimulation controls the pupil; controls crystalline focus, contracts the ciliary muscle
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body glands
The nasal, lacrimal, salivary and some gastrointestinal glands receive a stimulus from the parasympathetic nervous system
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Sympathetic stimulation causes the formation of a concentrated secretion with a high percentage of enzymes and mucus; causes vasoconstriction of blood vessels
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digestive system
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Sympathetic stimulation inhibits peristalsis and elevates the tone of the sphincters. Which could cause a slower propulsion of food through the digestive tract
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blood vessels
Sympathetic stimulation: contraction of the blood vessels of the systemic circulation and causes vascular dilation
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other bodily functions
sympathetic stimulation :Release of glucose from the liver,
Increased blood glucose,skeletal muscle strength power,basal metabolism acceleration.
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Parasympathetic stimulation: stimulates or excites the liver ducts, gallbladder, ureter, urinary bladder, and bronchi
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UNIVERSIDAD DEL VALLE DE MÉXICO TECHNICAL ENGLISH TEAM:
Alexia Leonor Nava Sanchez Alexis Hernandez Cepeda Bryan Vargas Torres David Rodríguez Hernandez Reyna Isabel Martinez Saucedo
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