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- 1. Multiple Choice
An electrical impulse within a single neuron is called a
synapse
membrane potential
action potential
cell body
- 2. Multiple Choice
Which ion is pumped into the axon of a neuron to help maintain the resting potential?
calcium
hydrogen
potassium
sodium
- 3. Multiple Choice
Which one of the following is involved in maintaining a resting membrane potential?
Na+/K+ ATPase pump moves 3Na+ in for every 2K+ out
Na+/K+ ATPase pump moves 3K+ in for every 2Na+ out
Na+/K+ ATPase pump moves 3Na+ out for every 2K+ in
Na+/K+ ATPase pump moves 3K+ out for every 2Na+ in
- 4. Multiple Choice
What is a characteristic of axons in motor neurons?
When there is a resting potential, the outside of the axon is negative relative to the inside.
During an action potential, Na+ ions diffuse out of the axon.
K+ ions diffusing out of the axon repolarizes it.
Impulses in the axon travel towards the cell body.
- 5. Multiple Choice
Depolarization occurs when
sodium channels open
potassium channels open
sodium channels close
potassium channels close
- 6. Multiple Choice
Depolarization is occuring at number
1
2
4
5
- 7. Multiple Choice
Which of the following uses ACTIVE transport?
sodium-potassium pump
sodium channel
potassium channel
diffusion
- 8. Multiple ChoiceWhat number(s) on the graph represents the Resting Potential?1 and 21 and 52 and 33 and 4
- 9. Multiple ChoiceWhen a membrane potential reaches +30mV, ________ channels open, ________ occurs, and ________ channels close.Sodium, depolarization, potassiumPotassium, depoloarization, sodiumsodium, repolarization, potassiumpostassium, repolarization, sodium
- 10. Multiple ChoiceWhat number on the graph represents the Hyperpolarization phase?1234
- 11. Multiple ChoiceWhy is -55 mV a significant number?This is the largest charge achieved during an action potentialThis is the threshold required to complete an action potentialThis is the resting charge of a neuronThis is the charge when all the sodium is inside the cell
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