nervous system
neuron
different kinds of neurons
sensory neuron
interneuron
action potential
how it works
resting stage
receive stimulus
resting stage: the cell has negative 70 mv. (potasium chanell open; sodium chanell closed)
stimulus needs to cause the cell has 55mv
then the sodium channel will open
sodium ions will rush back into the cell
as soon as the deplorization occur, replorization occur too
this is called "depolarization"
the peak is +40mv
refroctory stage
potasium channel remains open
potasium ions pushed out
resting stage
principle
all or nothing
neurontransmitter
after the signal is sent
the NT will either reabsorp
or enzyme deactivization
How does it influenced by drug
agonist
antagonist
mimic the action of nuerotransmitter; enhance NT activity
inhibit NT activity
where does it act on
presynaptic neuron
facilitate/inhibit release of NT
synaptic cleft
facilitate/block reabsorp of reactivization of NT
post synaptic neuron
facilitate/block the effect of NT
within the Central Nervous system
transmit information between neurons :
motor neuron
collect the sensory stimulus from the body to the central nervous system
rate of impulse conduction
depends on
myelinated
radius large
faster
faster
send the information from the central nervous system to musclar movement
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common structure of neuron
cell body
contains cell neurons
basic machinery functio
dendrite
receive input for the neurons
axon
carry message to other neurons
result
with each action potential
some potasium ions are moved out
some sodium ions moves in
this is why the sodium-potasium pump
bring potasium back and remove sodieum out
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what is it and how is it formed?
when action potential reaches the axon terminal
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release chemical package that diffuse among the cell and influence the action potential
it produced from the terminal of an axon terminal to pass through the synaptic cleft to the other cell
inhibitory synapse
open either chloride or potasium channel
excitory synapse
open soium channel and help with deplorization
it is the chemical package that released when action potential reaches the axon terminal
move between cells to help with the action potential comes to the receiving nuerons
increase action potential
help with replorization
decrease action potential
by the receiving neuron