Name: _________________________
Nerve Impulses
1. What is the sodium-potassium pump? In what phase of the action potential is it active?
2. What is diffusion?
3. What is an oscilloscope?
4. What is an action potential?
5. What are sodium gates? When do the sodium gates open?
6. What are potassium gates? When do the potassium gates open?
7. Nerve impulse – Action potential
Range of mV
Resting
potential
Depolarization
Repolarization
Refractory
period
Charge
inside the
neuron
Charge
outside the
neuron
Describe Na+ and K+ concentrations
or movement
8. On the following nerve impulse label:
a)
b)
c)
d)
e)
9.
Threshold
Resting potential
Depolarization
Repolarization
Action potential
f)
g)
h)
i)
Refractory period
When sodium ions move inside
When potassium ions move outside
When Na+/K+ pump in action
During the refractory period, why are the sodium and potassium gates unable to open for a brief amount of time?
10. Put the following statements in proper order.
______ Membrane is depolarized
______ Potassium gates open
______ Sodium-potassium pump restores resting potential
______ Sodium is inside neuron, potassium is outside
______ Sodium is outside neuron, potassium is inside
______ Sodium gates open
11. Explain what is happening in the following diagrams
Explanation:
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