Multiple Choice
Which of the following is not considered a type of gated ion channel?
9. Transport Across Membranes
Ion Channels and Membrane Potential
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When the concentration of ions is exactly the same on either side of the membrane, then the cell is at a resting membrane potential.
A
True
B
False
Verified step by step guidance1
Understand the concept of resting membrane potential: It is the electrical potential difference across the cell membrane when the cell is in a non-excited state.
Recognize that the resting membrane potential is not zero, even when ion concentrations are balanced. It is typically negative inside the cell relative to the outside.
Identify the role of ion gradients: The resting membrane potential is maintained by the difference in concentration of ions, particularly sodium (Na+) and potassium (K+), across the cell membrane.
Consider the function of ion channels and pumps: The sodium-potassium pump actively transports Na+ out of the cell and K+ into the cell, contributing to the potential difference.
Conclude that the statement is false because the resting membrane potential is not simply a result of equal ion concentrations on either side of the membrane, but rather the result of specific ion distributions and membrane permeability.
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