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ufgatorgirl ufgatorgirl
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11 years ago
Pre-Lab

Which of the following occurs first in the generation of an action potential?
Which of the following occurs first in the generation of an action potential?
    The membrane depolarizes.
    The membrane repolarizes.
    Voltage-gated potassium channels open.
    Voltage-gated sodium channels open.

Which of the following occurs during depolarization?
Which of the following occurs during depolarization?
    Voltage-gated potassium channels close.
    Sodium flows into the cell.
    Voltage-gated sodium channels close.
    Both A and C occur.
    All of the above occur.

Which of the following occurs during repolarization?
Which of the following occurs during repolarization?
    Voltage-gated sodium channels open and some voltage-gated potassium channels inactivate. Sodium flows out of the cell.
    Voltage-gated sodium channels open. Sodium flows into the cell.
    Voltage-gated potassium channels remain open and some voltage-gated sodium channels inactivate. Potassium flows into the cell.
    Voltage-gated potassium channels open and some voltage-gated sodium channels inactivate. Potassium flows out of the cell.
    Voltage-gated potassium channels open and potassium flows into the cell.

Which of the following allow the movement of potassium through the neuronal membrane?
Which of the following allow the movement of potassium through the neuronal membrane?
    leakage channels
    simple diffusion
    voltage-gated potassium channels
    leakage channels and voltage-gated potassium channels

Post Lab

Why does the threshold increase when the interval between the stimuli decreases?
Why does the threshold increase when the interval between the stimuli decreases?
    Sodium is flowing out of the cell.
    Potassium is flowing into the cell.
    Calcium is flowing out the cell.
    Some sodium channels have been inactivated and cannot be reopened immediately.

During the relative refractory period, _______.
During the relative refractory period, _______.
    the flow of potassium is also depolarizing the neuron.
    a second action potential cannot be generated, no matter how strong the stimulus.
    another action potential can be generated provided the stimulus is relatively smaller than the original stimulus.
    another action potential can be generated provided the stimulus is large enough.

When the interval between the stimuli decreases, _______.
When the interval between the stimuli decreases, _______.
    a second action potential is generated as long as the stimulus is above threshold
    a second action potential is generated until the interval reaches the absolute refractory period
    a second action potential is generated until the interval reaches the relative refractory period
    a second action potential is generated regardless of the stimulus and the interval

When the stimulus voltage is increased, _______.
When the stimulus voltage is increased, _______.
    a greater-than-threshold depolarization results
    a greater-than-threshold depolarization results and sodium permeability into the cell increases to overcome the potassium exiting.
    sodium permeability into the cell increases to overcome the potassium exiting
    sodium permeability into the cell decreases

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bio_manbio_man
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10 years ago
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