Question

For each numbered area (1 - 4) in the top figure, find the corresponding part of the action potential trace in the bottom figure (time in msec)and describe amount and direction of Na+ flow. 1. 2. 3. 4. Why do the Na+ ions entering in region B cause opening of Na+ channels in region C but not in region A? 1. Which of the following is/are TRUE? (Select ALL that are TRUE.) a. The flow of potassium ions in the leak current that sets the resting potential of the plasma membrane occurs because potassium ions are small enough to pass directly through the phospholipid bilayer. b. The potassium leak current involves net movement of potassium ions out of the cell, down their concentration gradient. c. At resting potential, the inside of the plasma membrane has a net negative charge. d. Depolarization of the plasma membrane occurs through opening of voltage-gated potassium channels. e. Repolarization of the plasma membrane after the firing of an action potential requires inactivation of the voltage-gated sodium channels.

          For each numbered area (1 - 4) in the top figure, find the corresponding part of the action potential trace in the bottom figure (time in msec)and describe amount and direction of Na+ flow.
1.
2.
3.
4.
Why do the Na+ ions entering in region B cause opening of Na+ channels in region C but not in region A?
1. Which of the following is/are TRUE? (Select ALL that are TRUE.)
a. The flow of potassium ions in the leak current that sets the resting potential of the plasma membrane occurs because potassium ions are small enough to pass directly through the phospholipid bilayer.
b. The potassium leak current involves net movement of potassium ions out of the cell, down their concentration gradient.
c. At resting potential, the inside of the plasma membrane has a net negative charge.
d. Depolarization of the plasma membrane occurs through opening of voltage-gated potassium channels.
e. Repolarization of the plasma membrane after the firing of an action potential requires inactivation of the voltage-gated sodium channels.

For each numbered area (1 - 4) in the top figure, find the corresponding part of the action potential trace in the bottom figure (time in msec)and describe amount and direction of Na+ flow.
1.
2.
3.
4.
Why do the Na+ ions entering in region B cause opening of Na+ channels in region C but not in region A?
1. Which of the following is/are TRUE? (Select ALL that are TRUE.)
a. The flow of potassium ions in the leak current that sets the resting potential of the plasma membrane occurs because potassium ions are small enough to pass directly through the phospholipid bilayer.
b. The potassium leak current involves net movement of potassium ions out of the cell, down their concentration gradient.
c. At resting potential, the inside of the plasma membrane has a net negative charge.
d. Depolarization of the plasma membrane occurs through opening of voltage-gated potassium channels.
e. Repolarization of the plasma membrane after the firing of an action potential requires inactivation of the voltage-gated sodium channels.

Added by Manuel N.

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