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55 Cards in this Set
- Front
- Back
What type of reflex does the ANS use to control and modify organ function in an involuntary fashion?
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visceral
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What nervous system is critical for maintaingin homeostasis?
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ANS
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Clinically what system is the targe of many drugs?
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ANS
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2 divisions of ANS
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1) Sympathetic
2) Parasympathetic |
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NTs of sympathetic NS
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1) ACH
2) Epi 3) NE |
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NTs of parasympathetic NS
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ACH
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Which NS of the ANS manages stressful conditions?
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sympathetic
-parasympathetic manages relaxed state |
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Where does the sympathetic NS distribute?
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1) synapse
2) blood |
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Where does the parasympathetic NS distribute?
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only at synapse
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A characteristic structure of the ANS are ____ which are clusters of nerve cell soma outside CNS.
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ganglia
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compare pathways of somatic and autonomic nervous system
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very different
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In what NS do unmyelinated terminal neurons (post-ganglionic) create a diffuse response where many organs are effected at the same time?
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ANS
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_______ refers to how much SNS/PNS activity is occuring at a given time.
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autonomic tone
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NT at preganglionic synapse for both SNS and PNS
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ACH
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NT at postganglionic synapse for SNS and PNS
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SNS- NE or EPI (sometimes ACH)
PNS- ACH |
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4 drugs that mimic EPI/NE to stimulate parts of SNS
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1) Epinephrine
2) Methoxamine 3) Norepinephrine 4) Phenylephrine |
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locations of ganglia in PNS & SNS
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PNS- target organ
SNS- Sympathetic Chain Ganglions |
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What is the NT in SNS and PNS ganglia?
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ACH
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The PNS stimulates body activities that occur while at rest by releasing ____ at target synapses.
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ACH
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Where do PNS nerves exit in CNS?
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top or bottom
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What nerve innervates thoracic and abdominal organs?
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Vagus nerve
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Where are the cranial exit points?
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3) lacrimal g
7) pupillary m 9) salivary g X=Vagus n.>jugular faramen>hypogastic plexus |
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Pelvic CNS exit point
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S2-S4: -> Rectum, Bladder, & Genitals
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2 main receptor classes of PNS
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1) Nicotinic
2) Muscarinic |
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5 main receptor classes of SNS, Where are they found?
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Alpha 1- stimulatory, lets you constrict smooth muscle
Alpha 2- inhibits neurons (sex) Beta 1- heart, dilate smooth muscle (more calcium) Beta 2- lung Beta 3- fat |
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What NT a receptor does preganglionic SNS synapse require?
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NT- ACH
receptor- nicotinic |
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____ glands are very special SNS structures b/c their post-ganglionic endings release EPI & NE diretly into the blood stream, NOT INTO THE SYNAPSE!
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adrenal glands
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location of adrenal gland
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cortex
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location of adrenal ganglion
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medulla
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2 catecholamines that adrenal medulla releases
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85% adrenalin (EPI)
15% noradrenalin (NE) |
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What catecholamine would you die w/out if you were exposed to cold?
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adrenalin (EPI)
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Why do catecholamines effects last longer than ACH?
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b/c catecholamines are destroyed more slowly
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Norepinephrine and epinephrine occur everywhere ____ is.
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blood
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What does SLUD stand for?
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Salivation
Lacrimation Urination Defication |
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Nicotine in tobacco stimulates andy nicotinic receptor for ____ regardless of location.
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acetylcholine
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The pupil controlled by the ANS is an ex. of _____by the PNS & SNS.
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dual innervation
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What is the actual pupillary diameter a balance of?
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SNS and PNS effects
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What happens to the pupil when the smooth muscle of the iris is relaxed?
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it enlarges
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In the SNS you want a ___ pupil so you can see better and fight better, you worry about injury to retina after the fight. SNS mediated contraction of the spoke-like smooth muscle facilitated this.
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dilated
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In the PNS, when resting you want ____ pupils to minimize potential injury to the retina.
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narrow
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Does the cerebral cortex have voluntary control of the ANS?
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No, although the cortex can influence ANS function.
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The cerebral cortex influences the ANS by modifying the function of special nuclei in the ____________.
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hypothalamus
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The hypothalamus modifies the function of nuclei in the _____.
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brainstem
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Nuclei in the _____ determine when most ANS output is sent out of the brain in tracts w/in the spinal cord or as cranial nerves.
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brainstem
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Urination & defication are ex. of the many autonomic reflexes that need only access to a section of the _____ and work independently of the brain.
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spinal cord
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2 types of sympathomimetic drugs
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1) phenylephrine
2) albuterol |
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2 types of sympathetic NS blocking drugs
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1) Propranolol
2) Yohimbine |
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3 types of parasympathomimetic drugs
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1) nicotine
2) muscarine 3) atropine |
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____ is an alpha-1 receptor and helps a runny nose
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phenylephrine
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____ is a beta-2 receptor to open airways and helps asthma
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albuterol
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____ blocks beta-1 receptors in heart from being activated
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propranolol
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____ blocks alpha-2 receptors from creating IPSPs
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yohimbine
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____ is a nicotinic receptor with wide ranging effects.
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nicotine
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____ is a muscarinic receptor that constricts pupils.
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muscarine
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____ blocks muscarinic receptor in eye during eye exam
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atropine
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