1. Label the significant membrane potentials and phases of the action potential in a neuron. Indicate which gates are open/closed as well as the direction of the net movement of sodium and potassium ions across the cell membrane for A-G. +30- 0- -55-B -70- -80- A 0 2 F 3 Time (ms) G

1. Label the significant membrane potentials and phases of the action potential in a neuron. Indicate which gates are open/closed as well as the direction of the net movement of sodium and potassium ions across the cell membrane for A-G. +30- 0- -55-B -70- -80- A 0 2 F 3 Time (ms) G

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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Place the following events in chronological order from 1-8: Nat enters the cell, and depolarization occurs to approximately +30 mV. The voltage across the cell membrane is -70 mV, the resting membrane potential. Upon reaching the peak of the action potential, the VG Nat channels are inactivated by the closing of their inactivation gate and the activation gate of each VG K channel opens. VG K channels close by the closing of their activation gate, and the resting membrane potential is gradually restored. An excitatory post-synaptic potential depolarizes the membrane to threshold and the activation gate of VG Nat channels open. Upon returning to the resting membrane potential, VG Na channels are reset by opening of the inactivation gate and the closing of the activation gate. VG K+ channels are slow to close, resulting in an excess of K* efflux and hyperpolarization. Depolarization occurs as K+ flows out of the cell.
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1. The graph above represent time in milliseconds. At what time (in milliseconds) is the inside of the neuron the most positive and why? 2. Explain why the membrane potential changes at X 3. Explain what is happening at point C to the sodium and potassium ions and how this is affecting the membrane potential 4. Describe two things that contribute to the resting membrane potential
2. Hi, I was wondering If I labeled the attached picture correctly. I would appreciate your help
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4) A neuron with ionic gradients described in the table below receives a synaptic input that opens channels that conduct Na. If the resting membrane potential is –60 mV and the change in conductance is 20 nS, what is the magnitude of the Na current (INa)? Concentration (mM) Ion Extracellular Intracellular Na+ 150 8 K+ 3.5 150
3. Explain all the electrical and mechanical events which occur during each measured wave, segment andinterval. An electrical event would be membrane polarization: depolarization, repolarization, restingmembrane potential, hyperpolarization etc; mechanical events include blood flow, open or closed valves,heart sounds, contraction, relaxation, pressure changes, etc. An example of a complete answer for the P waveis given below. Feel free to use your lecture and/or textbook as a reference to make the connections betweenECG and the cardiac cycle. This is a great way to review for the exam and apply what you are learning. P Wave – During the P wave, depolarization is sweeping from the SA node throughout both atria (electricalevent). This leads to the beginning of atrial contraction (mechanical event).PR Interval -P-R Segment –QRS Complex –Q-T Interval –S-T Segment –T Wave –T-P Segment –R-R Interval –
Place the steps of the action potential in order. 3. a brief reversal of membrane potential that travels along the axon mechanism that restores the resting membrane voltage and intracellular ionic concentrations 2.C reversal of the resting potential due to an influx of sodium ions 1. period during which potassium ions are diffusing out of the neuron because of a change in membrane permeability
Fill in the diagram, your illustration should demonstrate for each phase of the AP: 1. The relative concentration of K and Na 2. The relative voltage across the membrane 3. Any movement across the membrane of K and NA 4. The three kinds of channels in the membrane, and their state (open or closed) 5. Finally, indicate on the graph of the AP which phases correspond to hyper- polarization and which phases correspond to de- polarization Outside Outside Inside Inside Outside Inside Outside 1 Outside Inside Inside
a. a decrease in the frequency of process A O b. a decrease in the intensity of process A an increase in the intensity of process A d. an increase in the frequency of process A Use the following information to answer the next question O c. Membrane potential (mv) -55 Action potential of a neuron in respo stimulus of -55 mV D A B Compared to the diagram above, an electrochemical stimulus of -20 mV will result in Time
6. Please help answer all parts to this question, thank you so much!! :)