Multiple Choice
Action potentials are generated along a neuron because __________.
45. Nervous System
Neurons and Action Potentials
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The sodium-potassium pump __________.
A
expels sodium and potassium from the cell
B
pumps sodium into the cell
C
pumps sodium and potassium into the cell
D
allows ions to move in either direction through the membrane
E
expels sodium from the cell
Verified step by step guidance1
Understand the function of the sodium-potassium pump: It is a type of active transport mechanism found in the cell membrane that helps maintain the cell's electrochemical gradient.
Recognize that the pump uses ATP to transport ions against their concentration gradient, which means it moves ions from areas of low concentration to areas of high concentration.
Identify the specific ions involved: The sodium-potassium pump moves sodium ions (Na⁺) out of the cell and potassium ions (K⁺) into the cell.
Note the ratio of ions transported: For every three sodium ions expelled from the cell, two potassium ions are brought into the cell.
Conclude that the primary function of the sodium-potassium pump is to expel sodium from the cell while bringing potassium into the cell, maintaining the necessary balance for cellular function.
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