Which of the following statements regarding postsynaptic potentials is correct? IPSPs are the result of influx of potassium ions and EPSPs are the result of efflux of sodium ions. IPSPs are the result of efflux of potassium ions and EPSPs are the result of influx of chloride ions. IPSPs are the result of efflux of potassium ions and EPSPs are the result of influx of sodium ions. IPSPs are the result of efflux of chloride ions and EPSPs are the result of efflux of calcium ions.

Which of the following statements regarding postsynaptic potentials is correct? IPSPs are the result of influx of potassium ions and EPSPs are the result of efflux of sodium ions. IPSPs are the result of efflux of potassium ions and EPSPs are the result of influx of chloride ions. IPSPs are the result of efflux of potassium ions and EPSPs are the result of influx of sodium ions. IPSPs are the result of efflux of chloride ions and EPSPs are the result of efflux of calcium ions.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 3TAHL

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A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b Next
Excitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.
Which of the following statements best describes the properties of a myelinated axons? The axon has an even distribution of ion channels but it is covered by layers of myelin apart from short sections termed the nodes of Ranvier where there is no myelin. The action potential is able to jump from node to node because the myelin sheath increases the length constant. There are very few ion channels underneath the myelin. The density of Na+ channels at the nodes of Ranvier is very high but there are no K+ channels in myelinated axons. The myelin sheath increases the rate of action potential conduction because the action potential underneath the myelin sheath travels faster than an action potential in an unmyelinated axon.
You are doing a nerve conduction velocity test as shown in the diagram. If the test is performed on a multiple sclerosis patient whose myelinated axons are attacked, how would the conduction velocity differ from that recorded from a normal healthy person? Nerve Monitor Nerve Conduction Velocity Test (NCCV Test) conduction velocity will be faster in the patient. conduction velocity will be slower in the patient. O only the conduction of autonomic nerve is affected. O other:
If a potassium channel is held open for even longer, leading to an even bigger hyperpolarization of the cell what will happen in an afferent neuron? action potentials will have a larger amplitude action potentials will have a small amplitude less frequent action potentials in the neuron more frequent action potentials in the neuron
Which of the following statements is TRUE about the depolarization phase of action potential? Group of answer choices: Na-K pump initiates depolarization. Potassium ion channels quickly opens to allow efflux of ions. Depolarization is characterized by the movement of calcium ions out of the cell. Depolarization is primarily triggered by opening of sodium ion channels asap pls
The falling phase of the action potential is due to: Na+ influx through voltage-gated Na+ channels. O Na* efflux through voltage-gated Na* channels. OK* influx through voltage-gated K+ channels. O K+ efflux through voltage-gated K channels. O Nat influx through Na* leak channels. Na efflux through Na+ leak channels. O K+ influx through K+ leak channels. O K+ efflux through K+ leak channels.
During the relative refractory period, a larger than normal stimulus is required to generate an action potential. Which of the following statement/s explains this situation? O the inside of the cell is hyperpolarized and farther away from threshold O potassium voltage gated channels closed too soon and prevented potassium ions entering the cell potassium voltage gated channels did not all close at the same time and more than the required number of potassium ions exited the cell a and c « Previous Next
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
Which is TRUE about neuronal membrane electrical and concentration gradients at the peak of the action potential? The electrical gradient is in a direction that would tend to move K+ out of the cell. The concentration gradient for K+ is in a direction that would tend to move it into the cell. O The concentration gradient for K+ greatly increases compared to at rest. The concentration gradient for Na+ is in a direction that would tend to move it out of the cell. O The electrical gradient for Na+ is in a direction that would tend to move it into the cell.
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In the autoimmune disease multiple sclerosis, a person's immune system attacks and destroys the myelin sheath cells. What occurs as a result of the destruction of these cells? Action potentials can travel in two directions. None of the answer choices are correct. O The sodium-potassium pumps malfunction. The speed of action potentials decreases. Signals cannot be transmitted across the synapse.