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Excitable Cells (Excitable cells (characteristic (action potential (phase,…
Excitable Cells
Excitable cells
type
nerve cell
muscle cell
characteristic
resting membrane potential
movement of ion
force
chemical
equilibrium potential
The Nernst Equation
The Goldman Equation
electrical
#
type
Cl-
K+
#
-80
-->resting permeability最大
Na+
Ca++ 123
channel and pumps
permeability
resistance=1/conductance
External solution
Na+無影響
K+
depolarized;no action potential
Ca++ pump
Na+-K+ pump
-65~70mV
action potential
phase
refractory period (different cell)
one-way propagation
cardiac muscle cell
neuron
threshold
<--permeability(通道開關)(跟equilibrium potential關係不大)
all or none
反應大小by 頻率
distance
其實只是membrane potential-->myelinated有無傳導速率的差別
Voltage clamp
分層-->區別不同ion的影響
pharmaceutics
Na+
blocker
intracellular
Local anesthetic:Lidocain
extracellular
河豚:Tetrodotoxin
shellfish:Saxitoxin
activator
青蛙:Batrachotoxin
Ca++
different response to different cell
Bilayer membrane
capacitor