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- 1. Multiple Choice
What is the charge on the outside of the axon during the resting membrane potential?
+
-
neutral
- 2. Multiple Choice
Where is the concentration of sodium ions higher during the resting membrane potential?
Outside
Inside
- 3. Multiple Choice
What structure is used to maintain the resting membrane potential?
Na/K pump
leakage channels
voltage gated channels
secretory vessicles
- 4. Multiple Choice
During an action potential, _____ ions flow INTO the axon and _____ ions flow out of the axon.
Na, K
K, Na
Na, Cl
Cl, Na
- 5. Multiple Choice
During repolarization _____ ions flow ______ the axon
K, into
K, out of
Na, into
Na, out of
- 6. Multiple Choice
What term describes the movement of excess K ions such that the membrane potential becomes more negative than -70Mv?
hyperpolarization
repolarization
subthreshold
threshold
- 7. Multiple Choice
What happens if not enough Na+ enters the axon to reach the threshold potential?
nothing
a weak impulse
a slow impulse
a full impulse
- 8. Multiple Choice
The depolarization of the axon stimulates the opening of adjacent ion channels, which causes the depolarization of that area of the axon resulting in the opening of other ion channels. This describes...
Positive Feedback
Negative Feedback
Threshold Stimulus
Subthreshold Stimulus
- 9. Multiple Choice
What 2 forces cause the sodium ions to move into the axon during depolarization?
Concentration Gradient
Electrical Gradient
Na/K pump
Voltage Gated Channels
- 10. Multiple Choice
What is the numerical value of the resting membrane potential of an axon?
-70mV
70mV
7.35-7.45
30 puffballs
- 11. Multiple Choice
Which describes the action of the Na/K pump?
3 Na into the cell/ 2 K out
2 Na into the cell/ 3 K out
3 Na out of the cell/ 2 K in
2 Na out of the cell/ 3 K in
- 12. Multiple Choice
When the threshold stimulus is reached, what best describes the flow of K ions?
Against the concentration gradient into the cell
Against the concentration gradient out of the cell
With the concentration gradient out of the cell
With the concentration gradient into the cell
- 13. Multiple Choice
Which type of membrane protein opens in response to the neurotransmitter attaching to it?
Ligand gated channel
Voltage gated channel
Mechanically gated channel
Ion Pump
- 14. Multiple Choice
Which best describes the movement of Na ions through a leakage channel?
Diffusion into the cell
Diffusion out of the cell
Active transport into the cell
Avtive transport out of the cell
- 15. Multiple Choice
Which best describes the axon when the neuron is at rest (not conducting an impulse)?
Polarized
Depolarized
Repolarized
Hyperpolarized
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