4. Ion Pump Stoichiometry & Leak Channels

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8 Terms

1
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How many sodium and potassium ions are moved by the sodium-potassium pump?

3 Na+ out and 2 K+ in

2
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In what direction does the sodium-potassium pump move sodium?

Moves 3 Na+ out

3
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In what direction does the sodium-potassium pump move potassium?

Moves 2 K+ in

4
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What is the function of calcium pumps?

Pumps calcium ions across membrane

5
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Which ion leaks out of the cell through leak channels?

Potassium ions

6
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Which ion leaks into the cell through leak channels?

Sodium ions

7
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How does the number of potassium leak channels compare to sodium leak channels?

There are more K+ leak channels than Na+ leak channels

8
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Why is the neuron membrane more permeable to potassium than to sodium?

There are more K+ leak channels than Na+ leak channels