Multiple Choice
When the concentration of ions is exactly the same on either side of the membrane, then the cell is at a resting membrane potential.
9. Transport Across Membranes
Ion Channels and Membrane Potential
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
K+ leak channels are important for doing what?
A
Keeping a steady level of K+ inside the cell
B
Keeping a steady level of K+ outside the cell
C
Maintaining a strict concentration gradient across the membrane
D
Maintaining membrane potential
Verified step by step guidance1
Understand the role of K+ leak channels: These channels allow potassium ions (K+) to move across the cell membrane, typically from inside the cell to the outside, due to the concentration gradient.
Recognize the concept of membrane potential: The membrane potential is the voltage difference across a cell's plasma membrane, which is crucial for various cellular processes.
Identify the contribution of K+ leak channels to membrane potential: As K+ ions move out of the cell through these channels, they leave behind a negative charge inside the cell, contributing to the negative resting membrane potential.
Consider the balance of ion movement: While K+ leak channels allow K+ to exit the cell, the Na+/K+ pump actively transports K+ back into the cell, maintaining the concentration gradient and membrane potential.
Conclude the importance of K+ leak channels: By allowing K+ to move out of the cell, these channels help maintain the membrane potential, which is essential for nerve impulse transmission and muscle contraction.
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