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Ch exam 3
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Central Nervous System
Brain and Spinal Cord
Brain and Spinal Cord Roles
Send and Recive messages throught the body
Peripheral Nervous System
Sensory and Motor
Sensory's Role
Tells the body what is going on outside from within
Motor's Role
Sends info from CNS to body parts
Autonomic
Involuntary Internal function
Golgi Tendon Organ
Detects Tension of muscle on its tendon Sensitive to change in tension
Kinesthetic Receptors
Sense the postion and Movement of joints
Sympatic
Fight or Flight prepare body for crisis
Parasympathetic
HouseKeeping: Digestive system
Dendrites
Recive signal
Somatic
voluntary movement
Cell Body
Decsion making process
Cell Axon
Neuron transmitter (impulse takes place)
Myelin Sheath
Helps velocity of conduct
Synaptic Cleft
Where chemical is released
Node of Ranvior
Where impulse jumps from +
Resting Membrane Potential
Difference between the electrical charges inside + outside a cell, caused by seperation of change across the cell
Depolarzation
Inside of cell becomes
less
negative relative to outside
NA+ (-70mv)
Hyperpolarzation
inside of cell becomes
more
negative to outside
Graded Potentials
Local changes
in membrane potential ( De/Hyper polarzation) either.
Action Potential
Rapid
substantial depolarzation of the cell membrane
(-70mv+30mv+-70mv)
RMP change and Charge
Charge -70
Change - 15mv to 20mv
Threshold Stimulis
All or nothing
Neural Impulse
Sodium (Na+)
Potassium (K+)
5 Events of Action Potential
Resting State
Depolarzation
Action Potential
Repolazation
Return to Resting State
Myelination and Size Relate to Velocity
Saltatory conduction
Action potentinal travels quickly
Action potentinal is faster
Conduct Never impulse faster If larger
Synapes
Impulse transmission
of Neurons to another
Muscle Spindale
Sense how much muscle is strecthed
Function
:
Muscle attached to spindle strecthed neurons on spindle trasmit info to CNS about the muscle length
Synapes Communicate
Impulse travels to a Presynaptic axon terminal,
Synaptic vesicles to release neurotransmitters to the synaptic cleft
neurotransmitters bind to postsynaptic receptors on Postsynaptic neuron
Refactory Period
Period of repolarzation
Muscle Fiber unable to responed to stimulation
Limit motor unit firing
Common Neurotransmitters
Acetylcholine
Norepinephrine
Neurons Communicate
Releasing neurotransmitters across synapses
Neurotransmitter bind to receptor
De or Hyper polarzation occur
Neurotransmitter is destroyed by enzymes into the presynaptic terminal
Mechanorecptor
Mechanical force
Pressure
Touch
Vibration
Strecth
Thermorecpetor
Change in Tempature
Nociceptors
Painful stimuli
Photoreceptor
Light to allow Vision
Chemoreceptor
Chemical Stimuli
Foods
Ordor
Blood concetrations
Author
rsanchez15
ID
90656
Card Set
Ch exam 3
Description
Exercsing Muscle
Updated
6/15/2011, 5:25:13 PM
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