On the graph above, when do the sodium ion channels close? Select one: a. between 0.2 ms and 0.5 ms, which is when depolarization occurs b. at 0.2 ms, which is when depolarization occurs c. at 0.5 ms, which is when repolarization begins d. between 0.5 ms and 0.8 ms, which is when repolarization occurs

Dr. Brainy creates a nerve cell that is only permeable to Caesium ions (Cs+1) at rest. She measures that the concentration of Caesium is 400mM outside the cell and only 50 mM inside the cell. She calculates the Equilibrium potential for Cs+1 (Ecs) to be +35 mV. If the cell is only permeable to Cs, the resting membrane potential will be: +58 mV 0 mV +35 mV -58 mV

Show a complete circuit diagram of the model of the neuron using the specific numerical values for each component: potassium ion concentration outside: 4.0 mmol/L potassium ion concentration inside: 77.5 mmol/L

There is a type of toxin found in the liver of the puffer fish that prevents the opening of voltage-gated Na+ channels in neurons. The effect of this toxin is to: Group of answer choices A. prevents the initiation of the action potential B. depolarizes the membrane potential and maintains it depolarized C. prolongs the return of the membrane potential to the resting level D. increases the duration of the action potential

A. There is a lower resistance in the lower panel at the point where voltage is measured. B. There is a greater capacitance in the lower panel at the point where voltage is measured. C. The membrane voltage measured in the lower panel is farther away from the current pulse.

What enables action potential to jump from one node of Ranvier to the next? A. Increased LC B. Increased membrane resistance OC. Decreased LC OD. A and B OE. B and C mmmmm

List the membrane potential value that would coincide with the following events: a. Resting membrane potential b. Graded potentials c. Threshold for action potentials d. Opening of Potassium Channels/Closing of sodium channels during action potential.

Which of the following allows the cell to recover from hyperpolarization during an action potential?   A. Stimulus gated sodium channels B. voltage gated sodium channels C. voltage gated potassium channels D. sodium/potassium pump

Ion channels are composed of different protein subunits. a. What features of an ion channel determine that ions are able to pass through the channel? Where is this found? b. Potassium channels are selective for potassium ions only. Sodium is a smaller ion than potassium yet is unable to pass through. Explain this behavior. What is the significance of an auxiliary subunit and why is this important? C.

For each phase, again, name the phase. Then draw in the figures below: Na+ and K+ channels. Draw them open or closed as appropriate. Where Na+ and K+ ions are located If Na+ or K+ are moving, draw the direction that they move. Make sure they move through their appropriate ion channel.