1. Explain how an action potential and graded potential are different. Where do they occur on a neuron? How long does each last? What kind of gates is each process using?

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Action Potential of Neurons Worksheet
1. Explain how an action potential and graded potential are different. Where do they occur on a
neuron? How long does each last? What kind of gates is each process using?
2. Describe the following in your own words
a.
resting potential
C.
hyperpolarization
e.
threshold
9.
3.
What triggers an action potential? What happens to the membrane to trigger an action potential?
4. What is a positive feedback loop? How does a neuron create a positive feedback loop (self-
propagation)
5.
What is the role of the voltage-gated sodium channels for producing an action potential?
6. What is the role of the voltage-gated potassium channels?
7.
What would happen if the voltage gated sodium channels
a. Never opened?
b. Stayed open longer than normal?
8.
What is the absolute refractory period? What is the relative refractory period?
Consider the following three diagrams of a nerve cell membrane. They show resting potential,
depolarization, and hyperpolarization. Figure out which one is which, then draw them in the
order they occur in a cell that undergoes an action potential
outside
Na+
inside
K*
a.
C.
e.
g.
Na*
Na+
K+ Nat
Potential (mv) -70
0.2
Time (ms)
K+ Nat
potential: -80 mV
depolarization
hyperpolarization
repolarization
outside
-70 -65
0.5 0.7
Na+
K* Nat
inside
Na+
b.
d.
K+ Na*
-70 -70 -60 -70
1.0 1.5 1.7 2.0
depolarization
repolarization
potential: +30 mV
d.
f.
h.
Na+
-70
2.5
K*
10. Graph the following set of voltage and time data. Time in milliseconds should be on the x-axis
and membrane potential in millivolts should be on the y-axis. Label
absolute refractory period
b.
outside
Nat
-50
3.0
K*
inside
Nat Na Na Na
K*
K*
potential: -70 mV
action potential (AP)
graded potential
relative refractory period
resting membrane potential
+30 -65 -75 -78 -71 -70
3.5 4.0 4.2 4.5
5.0 5.5
Transcribed Image Text:Action Potential of Neurons Worksheet 1. Explain how an action potential and graded potential are different. Where do they occur on a neuron? How long does each last? What kind of gates is each process using? 2. Describe the following in your own words a. resting potential C. hyperpolarization e. threshold 9. 3. What triggers an action potential? What happens to the membrane to trigger an action potential? 4. What is a positive feedback loop? How does a neuron create a positive feedback loop (self- propagation) 5. What is the role of the voltage-gated sodium channels for producing an action potential? 6. What is the role of the voltage-gated potassium channels? 7. What would happen if the voltage gated sodium channels a. Never opened? b. Stayed open longer than normal? 8. What is the absolute refractory period? What is the relative refractory period? Consider the following three diagrams of a nerve cell membrane. They show resting potential, depolarization, and hyperpolarization. Figure out which one is which, then draw them in the order they occur in a cell that undergoes an action potential outside Na+ inside K* a. C. e. g. Na* Na+ K+ Nat Potential (mv) -70 0.2 Time (ms) K+ Nat potential: -80 mV depolarization hyperpolarization repolarization outside -70 -65 0.5 0.7 Na+ K* Nat inside Na+ b. d. K+ Na* -70 -70 -60 -70 1.0 1.5 1.7 2.0 depolarization repolarization potential: +30 mV d. f. h. Na+ -70 2.5 K* 10. Graph the following set of voltage and time data. Time in milliseconds should be on the x-axis and membrane potential in millivolts should be on the y-axis. Label absolute refractory period b. outside Nat -50 3.0 K* inside Nat Na Na Na K* K* potential: -70 mV action potential (AP) graded potential relative refractory period resting membrane potential +30 -65 -75 -78 -71 -70 3.5 4.0 4.2 4.5 5.0 5.5
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