1.As part of the action potential, Na+ moves into the cell following the opening
ID: 145554 • Letter: 1
Question
1.As part of the action potential, Na+ moves into the cell following the opening of Na+ channels. Which of the following is TRUE?
The neuron will hyperpolarize.
Voltage-gated channels will close.
At the same time, equal amount of K+ ions will move out of the nerve cell to balance the Na+ moving into the nerve cell.
The charges (+/-) across the membrane in the area that Na+ moves in will change.
None of the above is correct.
2. The toxic compound Sarin inhibits the enzyme acetylcholinesterase at the level of the synapse. Which of the following will be a result of this inhibition?
The Na+ channels in the postsynaptic membrane will not be activated.
Uptake of Ca(2+) will not occur within the axon terminal.
The neurotransmitter will not be released by the presynaptic neuron.
The neurotransmitter will not be synthesized within the neuron.
The neurotransmitter will not be broken down.
3. Insulin participates in the regulation of blood glucose homeostasis by increasing the synthesis of glycogen in muscle.
True
False
4. Each neuron maintains a given resting potential across the cell's membrane that allows the neuron to function properly. What is responsible for maintaining that resting potential, and after an action potential was observed?
Special cells called glial cells.
Channels found in the plasma membrane that are activated by voltage.
The action potential that follows the action potential just observed.
A pump that moves Na+ and K+ across the cell's membrane by using ATP.
A pump that allows Ca+ to move out of the cell.
The neuron will hyperpolarize.
Voltage-gated channels will close.
At the same time, equal amount of K+ ions will move out of the nerve cell to balance the Na+ moving into the nerve cell.
The charges (+/-) across the membrane in the area that Na+ moves in will change.
None of the above is correct.
Explanation / Answer
1. at the same time, equal amount of K+ ions will move out of the nerve cell to balance the Na+ moving out of the nerve cell.
2. the neurotransmitter acetylcholine will not be broken down
3. true
4. a pump that moves Na+ and K+ across the cell membrane by using ATP.
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