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Chapter 11
Chapter 11
16
Physiology
Undergraduate 1
10/16/2011

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Term
Name the two subdivisions of the efferent division of the peripheral nervous system
Definition
Somatic & Autonomic
Term
What is another name for the Autonomic Nervous System?
Definition
visceral nervous system
Term
What is another name for the Somatic Nervous System?
Definition
voluntary muscular systems
Term
what are the three primary differences between the autonomic and somatic nervous system?
Definition
Autonomic nervous system is involuntary
Somatic Nervous System is voluntary
Autonomic Nervous System light myelinated or unmyelinated, conduction much slower, the effectors of the ANS are smooth, cardiac, and glands
Somatic NS heavily myelinated axons, extend from the CNS to the effector, rapid impulse conduction--skeletal muscles
Term
Effectors Orgnas of The Somatic Nervous System
Definition
Skeletal Muscles
Term
Effector Organs of the Autonomic Nervous System
Definition
Cardiac muslce, smooth muscle, and glands
Term
What are the differences between the ANS and SNS efferent pathways
Definition
ANS-two neuron chain
Preganglion neuron-lightly myelinate
Postganglion neuron-extends to effector organ, unmyelinated axon--conduction much slower than SNS.
Somatic NS: Heavily myelinated axons, extend from the CNS to the effector, rapid impulse conduction
Term
What are the two subdivision of the autonomic nervous system?
Definition
Parasympathetic-performs maintenance activities and conserves body energy
Sympathetic-mobilizes the body during extreme situations
Term
How do the Sympathetic and Parasympathetic divisons work together?
Definition
The two divisions counterbalance each other's activity--dual innervation
Term
What are the primary roles of the parasympathetic division of the ANS?
Definition
A person who relaxes after a mean
BP, heart rate, respiratory rates are low--Gastrointestinal GI tract activity is high, The skin is warm and the puplis are constricted---State of rest
Term
What are the primary roles of the sympathetic division of the ANS?
Definition
fight or flight--
Term
what is the neurotransmitter of the SNS
Definition
All fibers release Acetylcholine (ACh), excitatory effect-depolaration
Term
what is the neurotransmitter for ANS
Definition
Preganglionic Fibers release ACh
Postganglionic fibers realease norepinephrine (NE) (adrenergic) or ACh: effect is either stinulatory or inhibitory
Term
Why does the sympathetic divison have longer-lasting effects when compared to the parasympathetic division?
Definition
The sysmpathetic division exerts long lasting diffuse effects because it's released into the blood, which causes long lasting diffuse effects
Term
Which division has a more local control? More diffuse effects?
Definition
The parasympathetic division exerts short-lived, highly localized control. The sympathetic division exerts long lasting diffuse effects
Term
Can one division override the effects of the other? When?
Definition
Yes, the SNS can override the effects of PNS when an emergency arises, during excerise, fight or flight response
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