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1)

a) What happens when you use TTX to block voltage gated sodium channels?

b) The presence of food causes the Proton/Potassium pump to localize to the interior membrane of the stomach. It pumps __________ against the concentration gradient, while ______________ flow with the gradient.

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Deanna Hettinger
Deanna HettingerLv2
28 Sep 2019
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Related questions

What would be most strongly affected by a drug that inhibited the opening of voltage-gated potassium channels (also known as delayed rectifiers)?

A. Falling phase of an action potential

B. Rising phase of an action potential

C. Resting membrane potential

D. Threshold for an action potential

Why does the voltage during the undershoot phase of the action potential become more negative than the resting membrane potential?

A. During the undershoot potassium ions are flowing into the cell due to the reversal of the potassium concentration gradient occurring during the action potential

B. The undershoot phase results from a delay in the activation of sodium channels, resulting in some sodium channels being open after the voltage-gated potassium channels have closed. C. The potassium conductance is higher during the undershoot than during the resting membrane potential.

D. The concentration gradient for potassium has been reversed as a result of the action potential, and the undershoot phase lasts until this the concentration gradient is restored.

The following involves Ions during action potentials.

A. True or false: After an action potential the concentration gradient of sodium is significantly reduced

B. If the membrane potential is depolarized to -10mV which direction will potassium ions flow through voltage gated potassium channels?
a. Into the neuron
b. Out of the neuron
c. No net movement
d. Cannot be determined from the information given

6. Consider the presence of hemoglobin in the catheter bag. Whatsymptom would this loss of

hemoglobin most strongly and immediately be linked to in thepatient?

A. Loss of blood volume

B. Loss of heartbeat

C. Drop in blood oxygen saturation

D. Liver failure


When a neuron is stimulated, the area of the membrane at thepoint of stimulation becomes
more permeable to Na+. If a cell starts at resting potential(-70mv), and is then stimulated:
A. The membrane voltage will become < -70mV, because Na+will move OUT of the cell.
B. The membrane voltage will become > -70mV, because Na+will move OUT of the cell.
C. The membrane voltage will become < -70mV because Na+will move INTO the cell.
D. The membrane voltage will become > -70mV because Na+will move INTO the cell.

. At the peak of the action potential, the Na+ voltage-gatedchannels close, and K+ voltage-gated
channels open in response to the positive membrane potential.In order to return the cell to its
negative resting potential quickly:
A. K+ will diffuse along its concentration gradient INTO thecell.
B. K+ will diffuse along its concentration gradient OUT of thecell.
C. Na+ will reverse its direction of diffusion OUT of thecell.
D. The sodium-potassium pump will move Na+ OUT of the cell andK+ INTO the cell.
E. None of the above would return the cell to its negativeresting potential quickly.

You experiment with higher concentrations of toxin and findcases when the cell could not
repolarize at all or, if it began to repolarize, itimmediately depolarized again. This tells you that
the toxin:
A. Prevents voltage-gated K+ channels from opening.
B. Increases the speed that the Na+ ion channels open.
C. Prevents the Na+ ion channels from closing.
D. Makes the Na+ ion channels close too soon.
E. Doesn

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