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20 Cards in this Set
- Front
- Back
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What is the central control of te Autonomic Nervous system?
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CHASM:
Cerebral cortex Hypothalmus Amygdola Spinal Cord Medulla & Pons |
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What is the enteric Nervous system?
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The portion of the autonomic system in and around the intestines-- very discrete local control of function.
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What is the medullary and pontine control of key autonomic functions?
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SNS stim releases EPI and NE from Medulla(lower portion of pons) that trigger release of Ach by pregangleionic chollinergic fibers.
--- Contains the respiratory center, cardio inhibitory center, & vasomotor control |
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How do the ANS and PNS interrelate?
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?
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What is the PNS pathway?
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?
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What is the SNS pathway?
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intramediolateral grey columns --ventral horn--white rami--Paravertebral ganglia
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What are the CV reflexes of the ANS?
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Atrial Stretch
Bainbridge Reverse Bainbridge Baroreceptor Bezold Jarisch. |
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What is the Bainbridge Reflex?
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stretch receptors in the RA, Junction of VC/pulm veins cause an Increase in HR by 10-15% and a decrease in ADH (from post pit) causing diuresis. Atrial Nat pep released from RA also causes diuresis.
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What is the Baroreceptor Reflex?
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With a decreased in BP: Increase in SNS (Inc HR, Vasoconstriction)
With an Increase in BP: PNS: Dec HR and vasodilation |
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What is the Reverse Bainbridge Reflex?
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Vasoconrtiction increasing BP causes a drop in HR, (seen with phenylephrine)
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What is the Bezold-Jarisch?
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Responds with Hypotension, bradycardia and coronary artery dialtion to noxious stim in ventricles (Increased PNS, and Inc vagal tone) ...thought to be cardioprotective to such things as MI, thrombolysis, syncope, etc...
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Examples of ANS reflexes?
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Baroreceptor reflex
Oculocardiac Reflex Celiac Reflex Bainbridge Reflex Valsalva Reflex |
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Whaere is the Autonomic ganglia?
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?
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What is the makeup of ACh? How is it released?
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Synthesis occurs in the cytoplasm of nerve terminals. Choline acetyltransferase catalyzes the formation of ACh from the precursors choline and Acetyl-CoA (from mitochondria0
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What is the function of the autonomic ganglia?
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?
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How is ACh degraded?
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Metabolized by Acetylcholinesterase
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What is the neurotransmitter released at the ganglionic terminals? What is the receptor type?
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Acetylcholine
receptors either muscarinic or nicotinic |
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What is the neurotransmitter released at the post-ganglionic terminals? What is the receptor type?
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Ach from the motor and PNS post ganglion terminals and Norepinephrine from the SNS postganglion terminals
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What is Co-transmission in relation to the ANS?
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Combinations of hormones or neurotransmitters which evoke specific responses-- most commonly involves combinations of three neurotransmitters (NE, ATP, NPY)
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What is the mass discharge effect of the SNS?
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" Stress Response "; it is a 1:20 ratio of pre to post ganglionic nerons...
-Inc. HR/BP -Inc BS/Glycolysis -Inc. muscle strength and mental activity -Inc Coagulation ratio |
