Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The Na+/K+ pumps and gated channels maintain the Na+ and K+ gradients necessary for action potentials to occur.
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11. Nervous Tissue and Nervous System
Resting Membrane Potential
Multiple Choice
Which of the following is the MOST important factor in generating resting membrane potential?
A
Na+ concentration gradient.
B
K+ concentration gradient.
C
K+ electrical gradient.
D
Na+/K+ ATPase.
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.
Identify the role of ion gradients: The resting membrane potential is primarily determined by the concentration gradients of ions across the membrane, particularly potassium (K+) and sodium (Na+).
Focus on the K+ concentration gradient: Potassium ions have a higher concentration inside the cell compared to outside. The movement of K+ out of the cell through leak channels is a major contributor to the resting membrane potential.
Consider the Na+/K+ ATPase pump: This pump helps maintain the concentration gradients of Na+ and K+ by actively transporting Na+ out of the cell and K+ into the cell, but it is not the primary factor in generating the resting membrane potential.
Evaluate the options: While the Na+/K+ ATPase and Na+ concentration gradient are important for maintaining ion gradients, the K+ concentration gradient is the most critical factor in generating the resting membrane potential due to its influence on the membrane's permeability to K+ ions.
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