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nervous system
• what is it?
• composition:
2 cell types
neurons
glia
neuron
VS. other body cells:
• how similar?
• how different?
- in function
- in structure
parts of neuron
- function
- structure
glia
neural communication
examples of
neural communication
neural communication
ELECTRO-CHEMICAL PROCESS
-graded potentials
-action potential
-neurotransmitters
neural communication
ELECTROCHEMICAL PROCESS
EPSP & IPSP
Do you know why graded potentials are
referred to as “Post Synaptic Potentials”?
graded potentials
the first electrical event
summation
temporal summation
spatial summation
summation
Why are they called “graded”?
action potential
the second electrical event
resting potential
Inside cell is negative relative to
the outside
-70 mv
types of polarization
depolarization
polarization
hyperpolarization
ion channels
sodium (Na+)
potassium (K+)
channels on axon
maintaining distribution
& resting potential
FORCES
2 factors: - selectively permeable membrane
- Na+/K+ pump
resting potential purpose
action potential
action potential
voltage-gated channels
all or none law
same intensity & speed no matter how
strong the initial stimulus voltage
saltatory conduction