10 Jun BIOLOGY 232 – Comparison between action potentials and synaptic
Question
2.Comparison between action potentials and synaptic potentials:
Function Action Potential Graded Potential
Depolarization/
Hyperpolarization
Magnitude
2. Specify which ion, if there is more of it inside or surrounding neurons.
intracellular Extracellular
Sodium
Potassium
Chloride
3. . List all the areas on the neuron and the type of potential dependent on the following types of ion channels:
Channel Areas of neuron Type of potential
Leak
Ligand gated
Voltage gated
4.What will happen to the resting membrane potential of an excitable cell if: ( indicate which way the membrane potential would change.)
a. extracellular fluid concentration of K+ ___________
b. ¯ extracellular fluid concentration of K+ ___________
c. extracellular fluid concentration of Na+ ___________
d. ¯ number of passive Na+ channels ___________
e. open voltage-gated K+ channels ___________
f. open voltage-gated Na+ channels ___________
5.Whicch are the characteristics of voltage-gated sodium channels.
______ Always open
______ Found along the axon
______ Important for action potential
______ Opened and closed by gates
______ Found on the dendrites and cell bodies
______ Important for resting membrane potential
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