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Characteristics And Physiology Of Pain
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Published on Nov 19, 2015
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PRESENTATION OUTLINE
1.
PAIN
THE CHARACTERISTICS AND PHYSIOLOGY
Photo by
hitthatswitch
2.
WHAT IS PAIN?
Sensation or discomfort
Stimulation of nerve endings
Travels from PNS to CNS
Photo by
Generation X-Ray
3.
REACTION & THRESHOLD
How a person reacts to the pain
Differs from person to person
Can vary from day to day
Photo by
Joaquin Villaverde Photography
4.
WHAT AFFECTS PAIN
Anatomy of area
Pain threshold
Age
Nationality
Gender
5.
THE NERVE
6.
Untitled Slide
7.
NERVE FIBERS
Myelinated- rapid conduction
Unmylenated- slow conduction
Determines the speed of impulse
Determines the type of pain perceived
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burningpaper
8.
RESTING STATE
Na+ on the outside
K+ on the inside
More negative on inside
Maintained by permeability (Na+ can't get in)
Maintained by sodium-potassium pump
Photo by
geezaweezer
9.
EXCITED STATE
Na+ enters the cell
K+ exits the cells
Permeability changes
10.
Untitled Slide
11.
KEY POINTS
Depolarization- ionic concentrations are reversing
Repolarization- polarity is returned (Na+ on outside)
Action potential- rapid changes in membrane potential
Absolute refractory period- membrane can't rexcite
Relative refractory period- greater stimulus needed to excite
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.-. Handle with care .-.
Noah Sherman
nshermansd@gmail.com
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