Multiple Choice
Why can't ions typically travel through the cell membrane?
2. Atoms & Elements
Ions
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What does the sodium/potassium (Na+/K+) pump transport across the cell membrane?
A
3 Na+ ions into the cell and 2 K+ ions out of the cell
B
3 Na+ ions out of the cell and 2 K+ ions into the cell
C
2 Na+ ions out of the cell and 3 K+ ions into the cell
D
2 Na+ ions into the cell and 3 K+ ions out of the cell
Verified step by step guidance1
Understand the function of the sodium/potassium (Na+/K+) pump: It is a type of active transport mechanism that moves ions across the cell membrane against their concentration gradients using energy from ATP.
Recognize that the Na+/K+ pump is crucial for maintaining the electrochemical gradient across the cell membrane, which is essential for various cellular processes, including nerve impulse transmission and muscle contraction.
Identify the specific ions involved: The pump transports sodium ions (Na+) and potassium ions (K+).
Recall the typical movement of ions: The Na+/K+ pump moves 3 Na+ ions out of the cell and 2 K+ ions into the cell per cycle.
Understand the significance of this ion exchange: By moving more positive charges out than in, the pump helps maintain a negative charge inside the cell relative to the outside, contributing to the membrane potential.
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