Podcast
Questions and Answers
What is responsible for depolarizing the cell and initiating the action potential?
What is responsible for depolarizing the cell and initiating the action potential?
- Sodium leaving the cell down its concentration gradient
- Potassium entering the cell down its electrochemical gradient
- Sodium entering the cell down its chemical and electrical gradient (correct)
- Chloride exiting the cell against its concentration gradient
At what point in the action potential does the Na+ inactivation gate begin to close?
At what point in the action potential does the Na+ inactivation gate begin to close?
- Before the cell depolarizes
- During the resting potential phase
- At the peak of the action potential (correct)
- After hyperpolarization is complete
What is the approximate peak potential reached during an action potential in a neuron?
What is the approximate peak potential reached during an action potential in a neuron?
- +60mV
- -70mV
- +90mV
- +30mV (correct)
During repolarization, what causes the return of the cell's membrane potential to its resting state?
During repolarization, what causes the return of the cell's membrane potential to its resting state?
What event marks the completion of an action potential in a neuron?
What event marks the completion of an action potential in a neuron?
Which process is responsible for maintaining the resting membrane potential in a neuron?
Which process is responsible for maintaining the resting membrane potential in a neuron?
What is the approximate resting membrane potential of a mammalian neuron?
What is the approximate resting membrane potential of a mammalian neuron?
Which ion has the highest concentration outside the mammalian neuron at resting potential?
Which ion has the highest concentration outside the mammalian neuron at resting potential?
What is the main energy source used by Sodium-potassium ATPase pumps to maintain ion gradients?
What is the main energy source used by Sodium-potassium ATPase pumps to maintain ion gradients?
What is the role of open potassium channels in the neuronal membrane at resting potential?
What is the role of open potassium channels in the neuronal membrane at resting potential?
What happens to the concentration of Cl- ions in the inner chamber of the artificial membrane model at equilibrium?
What happens to the concentration of Cl- ions in the inner chamber of the artificial membrane model at equilibrium?
How many Na+ ions are pumped out of the cell by the Sodium-potassium ATPase pumps for every 2 K+ ions pumped in?
How many Na+ ions are pumped out of the cell by the Sodium-potassium ATPase pumps for every 2 K+ ions pumped in?
What part of the neuron is responsible for receiving signals from other neurons?
What part of the neuron is responsible for receiving signals from other neurons?
Where are action potentials typically initiated in a neuron?
Where are action potentials typically initiated in a neuron?
Which organelle houses most of the neuron's organelles?
Which organelle houses most of the neuron's organelles?
What glial cells improve the efficiency of the axon by providing myelin sheaths?
What glial cells improve the efficiency of the axon by providing myelin sheaths?
What structure in a neuron increases the conduction velocity of an action potential?
What structure in a neuron increases the conduction velocity of an action potential?
Which part of the neuron transmits signals to other cells at synapses?
Which part of the neuron transmits signals to other cells at synapses?
What is the equilibrium potential for K+ according to the text?
What is the equilibrium potential for K+ according to the text?
If a cell membrane were permeable ONLY to Na+, what would be the hypothetical membrane potential according to the text?
If a cell membrane were permeable ONLY to Na+, what would be the hypothetical membrane potential according to the text?
What is the Resting membrane potential range according to the text?
What is the Resting membrane potential range according to the text?
Which ion's equilibrium potential is closer to the Resting membrane potential according to the text?
Which ion's equilibrium potential is closer to the Resting membrane potential according to the text?
What does the Nernst Equation calculate according to the text?
What does the Nernst Equation calculate according to the text?
What does a positive equilibrium potential (+62mV) for an ion indicate according to the text?
What does a positive equilibrium potential (+62mV) for an ion indicate according to the text?
What is the membrane potential threshold value for voltage-gated sodium channels to open?
What is the membrane potential threshold value for voltage-gated sodium channels to open?
What is the nature of the action potential with respect to its amplitude?
What is the nature of the action potential with respect to its amplitude?
What type of potential is the action potential?
What type of potential is the action potential?
What event triggers the opening of voltage-gated sodium channels in neurons?
What event triggers the opening of voltage-gated sodium channels in neurons?
What does the membrane potential threshold represent in neuronal action potential?
What does the membrane potential threshold represent in neuronal action potential?
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