Podcast
Questions and Answers
What is the membrane potential?
What is the membrane potential?
- The permeability of the cell membrane
- The voltage generated within the cell
- The difference in electrical potential between the inside and outside of the cell membrane (correct)
- The concentration of ions within the cell
What is a resting neuron's characteristic voltage state?
What is a resting neuron's characteristic voltage state?
- It has a rapid rise and fall in voltage
- It has a constant action potential
- It has a voltage across its membrane (correct)
- It has no voltage across its membrane
What contributes largely to the membrane potential?
What contributes largely to the membrane potential?
- (K+) present at high concentration at the extracellular matrix
- (Na+) and (Cl-) present at high concentration at the extracellular matrix (correct)
- (Cl-) present at high concentration at the intracellular matrix
- (Na+) and (K+) present at high concentration at the intracellular matrix
Which ion is impermeable to the cell membrane?
Which ion is impermeable to the cell membrane?
What is action potential?
What is action potential?
What is the membrane potential?
What is the membrane potential?
What contributes largely to the membrane potential?
What contributes largely to the membrane potential?
What is the characteristic state of a resting neuron's voltage across its membrane?
What is the characteristic state of a resting neuron's voltage across its membrane?
Which ion is impermeable to the cell membrane?
Which ion is impermeable to the cell membrane?
What is action potential?
What is action potential?
What is the main factor determining the membrane potential?
What is the main factor determining the membrane potential?
Which ion is impermeable to the cell membrane?
Which ion is impermeable to the cell membrane?
What contributes largely to the resting membrane potential?
What contributes largely to the resting membrane potential?
What is the characteristic pattern of action potential?
What is the characteristic pattern of action potential?
What is the main cause of generating electrical potential across the cell membrane?
What is the main cause of generating electrical potential across the cell membrane?
Flashcards are hidden until you start studying
Study Notes
Membrane Potential
- The difference in electrical charge across a cell membrane.
Resting Membrane Potential
- The characteristic voltage state of a neuron at rest.
- Typically around -70 millivolts (mV).
- Largely determined by the uneven distribution of ions across the cell membrane.
- Sodium (Na+) and potassium (K+) ions play a significant role.
- Potassium ions are more permeable to the cell membrane than sodium ions, resulting in a net negative charge inside the cell.
Ion Permeability
- Potassium ions are more permeable to the cell membrane than sodium ions.
- Sodium ions are largely impermeable to the cell membrane due to the sodium-potassium pump.
Action Potential
- A rapid change in the membrane potential of a neuron, allowing for communication between neurons.
- Characterized by a rapid depolarization followed by repolarization and hyperpolarization.
- Generated by the opening and closing of voltage-gated ion channels.
- Sodium ions flow into the cell during depolarization, causing a positive shift in membrane potential.
- Potassium ions flow out of the cell during repolarization, restoring the resting potential.
Key Contributors to Resting Membrane Potential
- The uneven distribution of ions across the cell membrane.
- The permeability of the cell membrane to different ions.
- The sodium-potassium pump, actively transporting sodium ions out of the cell and potassium ions into the cell.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
