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- 1. Multiple Choice
The image shows a neuron. Which letter shows the myelin sheath?
A
B
C
D
- 2. Multiple ChoiceWhen a cell is at rest, the inside is more _____ and the outside is more ______.negative; positivepositive; negative
- 3. Multiple Choice
The operation of the sodium-potassium "pump" moves:
sodium & potassium ions into the cell
sodium & potassium ions out of the cell
sodium ions out of the cell & potassium ions into the cell
sodium ions into the cell & potassium ions out of the cell
- 4. Multiple Choice
The diagram shows a graph of an action potential.
What is happening at X?
Sodium channels close.
Calcium channels open.
Sodium channels open.
Potassium channels close.
- 5. Multiple ChoiceWhat describes the phase of quick entry of sodium ions into an axon during an action potential?passive transportdepolarizationion transportrepolarization
- 6. Multiple ChoiceWhat generates a nerve impulse on the post-synaptic membrane?Calcium binding with a receptor sitePotassium leaking into the post-synaptic membraneNeurotransmitter binding with receptor sitesNeurotransmitter being removed from the synapse
- 7. Multiple ChoiceFor a neuron with a resting membrane potential at -70mv, an increase in the movement of sodium ions into the neuron's cytoplasm would result in:the depolarization of the neuron.the repolarization of the neuronthe replacement of potassium ions with sodium ions.the replacement of potassium ions with calcium ions.
- 8. Multiple ChoiceLabel the Neuron-What does the letter "A" represent?AxonDendriteAxon TerminalCell Body
- 9. Multiple ChoiceLabel the Neuron-What does the letter "D" represent?DendriteAxonMyelin SheathNode of Ranvier
- 10. Multiple ChoiceWhat is the insulating membrane that surrounds parts of the axon that helps the impulses travel faster called?AxonDendritesNode of RanvierMyelin Sheath
- 11. Multiple ChoiceWhat number on the graph represents the Threshold phase1346
- 12. Multiple ChoiceWhat number(s) on the graph represents the Resting Potential?1 and 21 and 52 and 33 and 4
- 13. Multiple Choice
The location of neurotransmitters
axon terminals
dendrites
Schwann cells
cell body
- 14. Multiple Choice
Which of the following best describes a neuron?
Specialized cells that protects the body from any foreign particles
Specialized cell that transports oxygen throughout the cardiovascular system
Specialized cell that functions to transmit electrical impulses within the nervous system
Specialized cells that receive and read signals sent from the body
- 15. Multiple Choice
What are the 3 stages in action potential? Select all that apply.
Depolarization
Repolarization
Refractory period
Resting potential
- 16. Multiple ChoiceWhat number on the graph represents the Repolarization phase?1234
- 17. Multiple Choice
Common pesticides used by gardeners contain neonicotinoids. What is the effect of a neonicotinoid pesticide on the transmission of a nerve impulse between neurons in an insect?
A. It prevents the release of acetylcholine from the presynaptic membrane.
B. It widens the synaptic cleft so diffusion of acetylcholine across the gap is slower.
C. It irreversibly binds with acetylcholine receptors on the postsynaptic membrane.
D. It interferes with the enzymatic breakdown of acetylcholine by acetylcholinesterase.
- 18. Multiple Choice
How does potassium move across the membrane of a neuron during repolarization?
A. Simple diffusion
B. Facilitated diffusion
C. Endocytosis
D. Active transport
- 19. Multiple Choice
What happens first when a neurotransmitter binds to a postsynaptic neuron?
Ions diffuse
Electrophoresis begins
Ca2+ channels open
Repolarization
- 20. Multiple Choice
What happens first when a electrical impulse arrives at the presynaptic neuron?
Electrophoresis begins
Ions diffuse
Ca2+ channels open
Repolarization
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