Multiple Choice
Which type of ion channels are highly concentrated in the nodes of Ranvier?
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11. Nervous Tissue and Nervous System
Ions - Sodium and Potassium
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Which of the following is true for the sodium-potassium (Na+/K+) exchange pump?
A
It moves sodium ions into the cell and potassium ions out of the cell.
B
It is a passive transport mechanism that does not require energy.
C
It moves equal numbers of sodium and potassium ions across the membrane.
D
It requires ATP to function and moves sodium ions out of the cell and potassium ions into the cell.
Verified step by step guidance1
Understand the function of the sodium-potassium pump: It is a type of active transport mechanism that moves ions against their concentration gradients.
Recognize that active transport requires energy, typically in the form of ATP, to move ions across the cell membrane.
Identify the direction of ion movement: The sodium-potassium pump moves sodium ions (Na+) out of the cell and potassium ions (K+) into the cell.
Note the ratio of ion exchange: The pump typically moves 3 sodium ions out of the cell for every 2 potassium ions it moves into the cell.
Conclude that the sodium-potassium pump is essential for maintaining the electrochemical gradient and proper cell function, requiring ATP to operate.
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