Chat with us, powered by LiveChat

Pages

Autonomic Nervous System – outline notes

By at September 24, 2011 | 9:37 am | Print

I. Somatic Nervous System  Vs. Autonomic Nervous System
A. Somatic NS – voluntary, skeletal muscle
-one neuron from brain/spinal cord releases Acetylcholine (ACh) on
skeletal muscle (nicotinic receptors)

B. Autonomic NS – involuntary; glands, heart, smooth muscle
-two chain neuron


II. Autonomic Nervous System (ANS) = Parasympathetic Nervous System (PNS) and Sympathetic Nervous System (SNS)




III. Functional Goals of SNS and PNS
A. SNS
-fight/flight
– mental alertness ——– stimulates reticular activating system
– metabolic rate
– digestive / urinary systems
-activates energy reserves – adipose, liver, muscle
– respiratory rate and dilation of bronchioles
-BP and HR
-activates sweat glands
-feeling of euphoria / temporary insensitivity to pain
– muscle tone, tremble with fear
-dilate pupils – distant vision
B. PNS
– metabolic rate
– HR and BP
– digestive activity (peristalsis and secretions) / salivary secretions
– blood flow to GI tract
– urination / defecation
-constrict pupils — focus on nearby objects
-constriction of respiratory passages
-sexual arousal – erection of penis and clitoris
-create energy reserves (glycogen and lipids)




IV. Neurotransmitters and Receptors
A. Acetylcholine (ACh) – cholinergic fibers
-somatic fibers
-all preganglionic fibers
-postganglionic fibers of PNS

Receptors that bind ACh
1. Nicotinic receptors
-SNS and PNS ganglia
-skeletal muscle (somatic NS)
-always excitatory
2. Muscarinic receptors
-all PNS organs served
-inhibitory and excitatory

****ACh is deactivated by AchE (cholinesterase)

B. Norepinephrine (NE) – adrenergic fibers
-sympathetic postgang. Fibers

Receptors that bind NE
1. Alpha receptors
alpha-1 (excitatory)
ex. vessels of digestive viscera
alpha-2 (inhibitory)
ex. Secretory glands of digestive system
2. Beta receptors
beta-1  (excitatory)
ex. Increase HR and force of contraction
beta-2 (inhibitory)
ex. Smooth muscle in airways, dilate

****NE is deactivated by Monoamine Oxidase (MAO)

Misc Articles Physiology outline notes

Related Posts

Trackbacks For This Post

  1. […] pressure < 90 mmHg (hypotension) 2. Pale, cool, clammy skin a. peripheral vasoconstriction b. Sympathetic Nervous System (SNS) – activity of sweat glands 3. Disorientation – decreased blood flow to brain 4. Tachycardia, […]

  2. […] polyps could also occur because the individual has an autonomic nervous system disorder.  Autonomic nervous system is divided into two classes.  The first one is sympathetic […]

2 Comments


Post Your Comments


× Yes, we are open and holding classes. We are following the American Heart Association guidelines regarding best disinfecting practices, as well as limiting our class size during this crisis. However, since our classes are smaller than usual, registration is limited. Please see our course calendar for online registration or contact us directly by phone, live chat or email with questions. Thank you.