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Questions and Answers
What is the resting membrane potential?
What is the resting membrane potential?
- The electrical potential difference across the plasma membrane of an excitable cell under resting conditions (correct)
- The voltage that exists across the plasma membrane of an excitable cell during signal transmission
- The voltage that exists across the plasma membrane of a non-excitable cell under resting conditions
- The electrical potential difference across the plasma membrane of an excitable cell during action potential
What maintains the resting membrane potential?
What maintains the resting membrane potential?
- An equal buildup of positive ions in the cytosol and negative ions in the extracellular fluid
- A buildup of positive ions in the cytosol and negative ions in the extracellular fluid
- An equal buildup of negative ions in the cytosol and positive ions in the extracellular fluid
- A buildup of negative ions in the cytosol and positive ions in the extracellular fluid (correct)
What is measured in volts or millivolts?
What is measured in volts or millivolts?
- Current flow
- Action potential
- Resting membrane potential
- Potential energy (correct)
What happens to the membrane potential if there is a greater difference in charge across the membrane?
What happens to the membrane potential if there is a greater difference in charge across the membrane?
What is the significance of the separation of positive and negative electrical charges across the membrane?
What is the significance of the separation of positive and negative electrical charges across the membrane?
Flashcards
Resting membrane potential
Resting membrane potential
The electrical charge difference across a cell membrane when it's not actively sending signals.
What maintains RMP?
What maintains RMP?
A difference in ion concentrations inside and outside the cell.
Units of RMP
Units of RMP
Measured in volts or millivolts (mV).
RMP and charge difference
RMP and charge difference
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Significance of RMP
Significance of RMP
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Study Notes
Resting Membrane Potential
- Resting membrane potential is the electrical potential difference across the cell membrane when the cell is not actively transmitting a signal, typically around -70 millivolts (mV).
- It is maintained by a higher concentration of potassium ions (K+) inside the cell and a higher concentration of sodium ions (Na+) outside the cell.
- The negative resting membrane potential is due to a slight excess of negative charges inside the cell compared to outside.
Electrophysiology
- The electrical potential difference across the cell membrane is measured in volts (V) or millivolts (mV).
- A greater difference in electrical charge across the membrane affects the membrane potential, making it more negative or positive depending on the direction of the charge shift.
Significance of Charge Separation
- The separation of positive and negative electrical charges across the membrane is crucial for generating electrical impulses, enabling cells to communicate and transmit signals.
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