A neuron has a resting membrane potential of -70 milivolts (mV) and a threshold value of -55 mV. Three synapses on the body of this neuron receive theimpulses listed below.hyperpolarisation by 5 mV• depolarisation by 15 mV• depolarisation by 10 mVENTER THE MEMBRANE POTENTIAL AS A NUMBER WITH + OR - IN FRONT OF IT.The final membrane potential will bemV and thiscause an action potential becasue it isv than the

Action potentials are the signals propagated through neurons in the form of electric impulse . These…

Answered: A neuron has a resting membrane…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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6. Identify the following structures on an image of a synapse: Postsynaptic neuron Presynaptic neuron Neurotransmitter Synaptic cleft Synaptic vesicles Receptor for neurotransmitter Cell adhesion molecules Axon terminal 7. hore CAFE Describe the actions of sodium and potassium during action potential generation as it relates to depolarization, repolarization, and hyperpolarization. State the directional flow of each ion and the state of the gated channels for each stage. See figure 12.15 in the textbook.
Which of the following statements are true with regards to the differences between a neuromuscular junction, and a standard central nervous system (CNS) synapse? Select all that apply. O The neuromuscular junction is a synapse between a neuron (alpha motor neuron) and a muscle fibre. CNS synapses connect two neurons. The graded potential generated by a neuromuscular junction has a much larger voltage than that of a CNS synapse. The structure of the neuromuscular junction ensures that an action potential in the alpha motor neuron always results in an action potential in the post-synaptic muscle fibre. CNS synapses do not guarantee this. The neuromuscular junction always uses Acetylcholine as a neurotransmitter, whereas CNS synapses may use a variety of neurotransmitters depending on their location and function
If a post synaptic neuron is stimulated to threshold by spatial summation this implies that the post synaptic cell has a lower than normal threshold the postsynaptic cell has many synapses with many presynaptic neurons the post synaptic cell is getting stimulated many times during a short period of time by a single presynaptic neuron the post synaptic cell is slow to repolarize
Synaptic delay :-a- is the time needed for release of neurotransmitter from synaptic vesiclesb- the minimal delay time in the central nervous system is about 0.5 millisecondc- is determined by the type of the neurotransmitterd- is determined by the number of postsynaptic receptors
Please help me to reorder the items below to correctly label the numbers in the diagram.
Membrane permeability at the rising phase of an action potential is dominated by: O Co-transporters Nongated Channels O K+ Voltage-gated Channels O Na+ voltage-gated Channels O Chemically-gated Channels
When a neuron reaches threshold voltage, all voltage-gated channels are triggered to make conformational changes. The order in which this happens comes down to the timing/speed/kinetics of the different gates on the channels. Put the following events in the order they occur after a neuron reaches threshold voltage. 1. Voltage-gated K+ channels finish closing their gate. 2. Voltage-gated Na+ channels open their activation gate, increasing Na+ permeability. 3. Voltage-gated Na+ channels close their inactivation gates, reducing Na+ permeability. 4. Voltage-gated K+ channels open their gate, increasing K+ permeability. 5. Voltage-gated Na+ channels reset to their original conformation.
Describe the action potential in terms of the different functional states of the voltage- gated Na+ membrane channels (Note: there are three states)
Plz answer correctly ASAP
Conditions: [Na+] outside = .3 mM [Na+] inside the presynaptic cell = .01 mM [dopamine] inside = .5 mM [dopamine] outside = .001 mM ΔGinward = RT ln [X] inside/[X] outside + z F Vm F = 23,000 cal/mol V R = 1.987 cal/ mol K Membrane potential is .07 V Temperature is 273 K Using the information above and image please answer these questions : Is the concentration of sodium higher on the outside or the inside of the presynaptic cell? Would the movement of sodium be active or passive moving OUT of the presynaptic cell? SHOW your work.
Compound X has been shown to block voltage-gated K+ channels with an IC50 of 0.1 mM. Which of the following is the most likely to occur in neurones following application of 0.03 mM X? Action potentials would be prolonged and the resting potential would be depolarised. Action potentials would be prolonged but the resting potential would remain the same. Neither resting potential nor action potentials would be affected because the concentration of X is less than the IC50 value. The resting membrane potential would depolarise but there would be no effect on action potentials.
Separately, draw a table using arrows to depict the appropriate magnitude and direction of the forces and ion fluxes at different membrane potentials for a ligand-gated channel that is equally permeable to both ion X+ and ion Y+. The equilibrium potential for ion X+ is -60 mV, and the equilibrium potential for ion Y+ is -20 mV. Which item (a, b, c, or d) best represents the forces and fluxes for a membrane potential of +20 mV? Upwards arrows means outward direction and downwards arrow means inward direction. The length of the arrow determines the magnitude.

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