Chapter 12 Joe Pistack MSED Autonomic nervous system Automatic responsethe bodys way of unconsciously and automatically making decisions and carrying them out for you The autonomic nervous systemis part of the peripheral nervous system that supplies motor activity to the visceral effec ID: 192365
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Autonomic nervous systemChapter 12
Joe Pistack MS/EDSlide2
Autonomic nervous system
Automatic response-the body’s way of unconsciously and automatically making decisions and carrying them out for you.
The autonomic nervous system-is part of the peripheral nervous system that supplies motor activity to the visceral effector organs, glands, smooth muscles within the organs and the heart.Slide3
Divisions of the ANS
The two divisions of the ANS are:
sympathetic
Parasympathetic
Dual Innervation a single organ receives nerve fibers from both divisions of the ANS
Sympathetic nervous system- is activated during periods of stress or times when a person feels threatened.
Called the “fight or flight” response.Slide4
Sympathetic nervous system
Causes you to either confront (fight)
or remove yourself from the threatening situation (flight).
Sympathetic nervous system is activated during periods of stress, normally short-lived periods.Slide5
Fight or flightSlide6
Fight or flightSlide7
Sympathetic Response
Heart rate increases
Bronchial tubes dilate(increase airflow)
Iris of the eye dilates (pupils enlarge)
Blood vessels constrict
Sweat glands stimulated
Inhibited intestinal mobility
Adrenal medulla stimulates secretion of epinephrine and norepinephrine
Salivary glands stimulate thick secretionsSlide8
Parasympathetic nervous system
Parasympathetic nervous system-most active during quiet,
non-stressful
conditions.
Has a calming effect on the body.
Plays an important role in the regulation of digestion and reproductive function.
Referred to as “feed and breed” or resting and digesting.Slide9
Parasympathetic nervous system
The parasympathetic system is activated in situations that are perceived hopeless and where “fight or flight” seems futile.
Symptoms are the opposite of sympathetic nervous
system
Body’s reaction to a more restful situation.
Ex. Nice spring day, sitting under a tree.Slide10
Parasympathetic Response
Decreased heart rate
Bronchial tubes constrict
Pupils Constrict
Salivary glands are stimulated with a watery secretion
Increased motility and secretion of the intestine
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Parasympathetic Response
Stimulus that can effect the parasympathetic nervous system may be stimulation of the vagus nerve, diagnostic testing that may stimulate a parasympathetic response. Ex. Colonoscopy.
A massive parasympathetic response may result in uncontrolled urination or defecation.
BradycardiaSlide12
As we age
There is a decrease in the speed of nerve conduction.
Decrease in reflexes.
Less efficient sympathetic nervous system response may cause transient
hypotension
and fainting.
Decline in nerve activity supplying changes in pupillary response and reactivity.
Decrease in the cranial nerves mediating taste and smell.