If the postsynaptic cell's plasma membrane were to become substantially more permeable to Na+, you would expect the membrane potential to [depolarize, hyperpolarize]
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If the postsynaptic cell's plasma membrane were to become substantially more permeable to Na+, you would expect the membrane potential to [depolarize, hyperpolarize] __________________. You would expect the membrane potential to depolarize if the extracellular K+ concentration were to [increase, decrease] ______________.
a.) hyperpolarize, decrease
b.) depolarize, decrease
c.) depolarize, decrease
d.) hyperpolarize, increase
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- If extracellular [Na1] is elevated, how would the resting potential and action potential of a neuron change?Describe the action potential in terms of the different functional states of the voltage- gated Na+ membrane channels (Note: there are three states)Graded potentials and action potentials are both changes in membrane potential created by ion movement between the extracellular and intracellular fluids.
- If a postsynaptic cell has synapses from five different cells, and three cause EPSPs and two of them cause IPSPs, give an example of a series of depolarizations and hyperpolarizations that would result in the neuron reaching threshold.match the listed events to note if they would, or would not, occur in a neuron under the effects of tetrodotoxin. the cell has a resting membrane potential of -65mV. You should match these events at the initial segment of a bipolar neuron, **Answer choice for all ( would occur, would not occur)Which of the following intracellular potentials would have the greatest electrical attraction for Na+ to enter the cell? -70mV Ⓒ) -100mV -50mV OmV +20mV
- At the peak of the action potential, Vm is approximately -65 mV. Assuming normal intracellular and extracellular K+ concentrations (refer to the table), (1) calculate the driving force (in mV) that acts on K+ ions and (2) use the information obtained in part 1 to determine the direction in which K+ ions will flow (i.e., into the cell or out of cell)Action potentials are “all or none.” Discuss this statement with reference to specific types of channels (60%). Explain what determines the frequency of action potentials (40%).Describe the three states of voltage-gated Na+ channels in neurons.
- The resting membrane potential is a negative value because of:In the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. Discuss the importance of threshold. How does this relate to the concept of APs being all or none?Based upon the changes in permeability seen in the trace below and your knowledge of ion distributions across a cell, predict how ion movements would change during an action potential. Drag and drop each phrase into the appropriate box on the action potential trace. Drag the appropriate labels to their respective targets. Note: not all labels will be used. ►View Available Hint(s) Sodium (Na+) ions move to the axon Sodium (Na) ions move out of the axon Less potassium (K) ions move out of the axon Potassium (K) ions move out of the axon Potassium (K¹) ions move into the axon Sodium (Na) ions stop moving in Membrane potential (mv) +30 +10 0 -10- -30 -50 -70 -90 A PNa 0 PNa 5 6 1 PK Threshold PK 2 Reset Help