6 Questions
Which of the following statements accurately describes the chemical gradient for potassium (K+) and sodium (Na+) ions across the plasma membrane?
K+ wants to move out of the cell, while Na+ wants to move into the cell.
What is the normal resting membrane potential inside the plasma membrane, measured in millivolts (mV)?
-70 mV
According to the electrical gradient, which ion wants to move into the cell, and which ion wants to move out of the cell?
K+ wants to move into the cell, Na+ wants to move out of the cell.
Which ion can cross the plasma membrane more easily?
K+
What is the primary driving force that determines the resting membrane potential?
The electrochemical gradient of K+ and Na+ ions.
Which of the following statements accurately describes the role of passive and active forces in establishing the resting membrane potential?
Both passive and active forces are involved, with passive forces being the primary contributors.
Study Notes
Resting Membrane Potential
- The resting membrane potential is influenced by passive forces, including chemical and electrical gradients of K+ and Na+ ions.
Chemical Gradient
- K+ wants to leave the cell due to chemical gradient.
- Na+ wants to enter the cell due to chemical gradient.
Electrical Gradient
- K+ wants to enter the cell due to electrical gradient.
- Na+ wants to leave the cell due to electrical gradient.
Ion Movement
- Na+ can cross the plasma membrane more easily than K+.
- Na+ wants to leak out of the cell.
- K+ wants to leak into the cell.
Resting Membrane Potential Value
- The normal resting membrane potential inside the plasma membrane is -70mV.
Electrochemical Gradient
- The combination of chemical and electrical gradients produces the electrochemical gradient for each ion.
- The electrochemical gradient forces K+ out of the cell and Na+ into the cell.
Test your knowledge on the passive forces that contribute to the resting membrane potential, including the direction in which ions such as Na+ and K+ want to move. Determine which ion can cross the plasma membrane more easily and recall the normal resting membrane potential in mV.
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