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ufgatorgirl ufgatorgirl
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Posts: 12
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11 years ago
Pre-Lab

An action potential requires _______.
An action potential requires _______.
    sodium to flow with its electrochemical gradient
    voltage-gated sodium channels to open
    voltage-gated sodium channels to open and sodium to flow with its electrochemical gradient
    chemically gated sodium channels to open

To reach threshold, the amount of sodium _______.
To reach threshold, the amount of sodium _______.
    entering the cell must overcome the potassium exiting
    exiting the cell must overcome the potassium entering
    entering the cell must overcome the potassium entering
    exiting the cell must overcome the potassium exiting

Which of the following blocks voltage-gated sodium channels?
Which of the following blocks voltage-gated sodium channels?
    potassium
    tetrodotoxin and lidocaine
    tetrodotoxin
    lidocaine

Which of the following is used to block pain?
Which of the following is used to block pain?
    potassium
    tetrodotoxin and lidocaine
    tetrodotoxin
    lidocaine

Post-Lab

Which of the following occurred in the presence of tetrodotoxin?
Which of the following occurred in the presence of tetrodotoxin?
    The size of the action potential increased.
    The size of the action potential decreased.
    The number of action potentials decreased.
    The number of action potentials increased.

Which of the following occurred in the presence of tetrodotoxin?
Which of the following occurred in the presence of tetrodotoxin?
    An action potential was always seen at R1.
    An action potential was always seen at R2.
    An action potential was always seen at R1 and R2.
    All action potentials were missing.

In the presence of lidocaine, the action potential was NOT affected at R1 because _______.
In the presence of lidocaine, the action potential was NOT affected at R1 because _______.
    lidocaine was applied downstream of R1
    lidocaine doesn't have an effect on the generation of action potentials
    lidocaine was applied upstream of R1
    there are no voltage-gated sodium channels to be affected

The effects of lidocaine and tetrodotoxin were _______.
The effects of lidocaine and tetrodotoxin were _______.
    identical
    similar, but lidocaine had a greater effect
    very different, because lidocaine had no effect
    similar, but tetrodotoxin had a greater effect
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wrote...
11 years ago
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wrote...
Valued Member
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11 years ago
Answers?

The thread's author needs to post two questions per thread. That's why the thread was left without a response.
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