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- 1. Multiple Choice
What is the numerical value for resting membrane potential (RMP) in a neuron or skeletal muscle cell?
150mV
-70mV
-90mV
15mV
- 2. Multiple Choice
The inside of the cell has a ______ charge compared to the outside
Positive
Negative
- 3. Multiple Choice
What direction does K+ leak through the leaky channels?
In
Out
- 4. Multiple Choice
Can large protein anions leave the cell?
Yes
No
- 5. Multiple Choice
If K+ was the only ion that mattered for RMP, RMP would have which numerical value?
-70mV
150mV
15mV
-90mV
- 6. Multiple Choice
What direction does Na+ leak through the leaky channels?
In
Out
- 7. Multiple Choice
Which of the two ions has the MOST leaky channels in the membrane?
Na+
K+
- 8. Multiple Choice
Which important pump in the cell membrane keeps the RMP at the right level at rest?
ATPase Pump
Topoisomerase Pump
Sodium ATPase Pump
Sodium Potassium ATPase Pump
- 9. Multiple Choice
____ Na+ are pumped _____ each time the pump turns.
3, In
2, In
3, Out
2, Out
- 10. Multiple Choice
____ K+ are pumped _____ each time the pump turns.
3, In
2, Out
3, Out
2, In
- 11. Multiple Choice
What kind of transport is used by the Sodium Potassium ATPase Pump?
Active Transport
Passive Transport
Facilitated Diffusion
Osmosis
- 12. Multiple Choice
Changing the membrane potential from -70mV to +30mV is called _____.
Depolarization
Hyperpolarization
Repolarization
- 13. Multiple Choice
Restoring the membrane potential to resting state (from +30mV back to -70mV) is called _________.
Depolarization
Hyperpolarization
Repolarization
- 14. Multiple Choice
Changing membrane potential from -70mV to -100mV is called ______.
Depolarization
Hyperpolarization
Repolarization
- 15. Multiple Choice
Depolarization usually turns a cell ______.
On
Off
- 16. Multiple Choice
Hyperpolarization usually turns a cell _______.
On
Off
- 17. Multiple Choice
What opens the voltage gated ion channel?
A Ligand
Force
An electric shock
Another cell
- 18. Multiple Choice
What opens the ligand gated ion channel?
opened by a chemical signal molecule
opened by stretching
opened by an electric shock
- 19. Multiple Choice
What opens the mechanically gated ion channel?
opened by a chemical signal molecule
opened by stretching
opened by an electric shock
- 20. Multiple Choice
What will happen if a positive ion such as sodium (Na+) moves into the cell?
Depolarization
Repolarization
Hyperpolarization
- 21. Multiple Choice
What will happen if a negative ion such as chlorine (Cl-) moves into the cell?
Depolarization
Repolarization
Hyperpolarization
- 22. Multiple Choice
The sodium channel is ____ and the potassium channel is _____ at the resting membrane potential.
Closed, Open
Closed, Closed
Open, Open
Inactivated by a stopper, Open
- 23. Multiple Choice
The sodium channel is ____ and the potassium channel is _____ during depolarization.
Open, Open
Closed, Open
Open, Closed
Inactivated by a stopper, Open
- 24. Multiple Choice
The sodium channel is ____ and the potassium channel is _____ during repolarization.
Open, Open
Closed, Open
Closed, Closed
Inactivated by a stopper, Open
- 25. Multiple Choice
The sodium channel is ____ and the potassium channel is _____ during hyperpolarization.
Closed, Open
Open, Inactivated by a stopper
Open, Open
Closed, Closing slowly
- 26. Multiple Choice
What would be a good title for this graph?
One action potential of a muscle or neuron
One action potential of ligand gated ion channels
One action potential in a skeletal muscle or neuron
One action potential of voltage gated ion chanels
- 27. Multiple Choice
Label the x axis.
Voltage in mV
Time in mSec
Time in Sec
- 28. Multiple Choice
Label the y axis.
Voltage in mV
Time in negative to positive mSec
Time in mSec
- 29. Multiple Choice
What is the voltage at point A?
-90mV
150mV
+30mV
-70mV
- 30. Multiple Choice
What is happening at point B?
Depolarization
Repolarization
Hyperpolarization
- 31. Multiple Choice
What is happening at point C?
Depolarization
Repolarization
Hyperpolarization
- 32. Multiple Choice
What has happened at point D?
Depolarization
Repolarization is complete
Hyperpolarization
- 33. Multiple Choice
What does the dotted line represent?
Minimal Voltage
Voltage Potential
The threshold
- 34. Multiple Choice
What happens if the dotted line is not reached?
There is no action potential if the signal is too low
The neuron or skeletal muscle cell will be turned on if the signal is too low
Potassium is allowed to enter the cell if the signal is too low
Sodium is blocked from entering the cell if the signal is too low
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