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

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

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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1. Why does the action potential not go back to where it came from? (Multiple answers possibly) the absolute refractory period prevents this from happening Sodium voltage gated ions in the area where the action potential just came from are fully activated or inactivated Sodium voltage gated ions bind to the Na+ ions, preventing them from diffusing backwards Na+ only diffuses forward in the axon 2. When neurotransmitter binds to _______________ at the dendrites, it results in a _____________ potential Ligand gated ion channels | action Voltage gated ion channels | action Voltage gated ion channels | graded Ligand gated ion channels | graded
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rearrange these in the correct order of events in an action potential.
A theoretical drug blocks Na* leak channels - what effect would this have on a neuron's resting membrane potential and why? Would this drug affect the neuron's ability to generate an action potential and why/why not?
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.
Matching (may not use all choices; may use some choices more than once) 45. Sección Release of inhibitory neurotransmitter 46. Decreased concentration of leaky sodium channels in the membrane Arsenic poisoning prevents mitochondria from making ATP 47. 48. Extreme sodium deficiency 49. Acetylcholinesterase concentration is decreased 50. Overdose of Potassium Chloride 51. Increased concentration of leaky potassium channels in the membrane Salto de columna A. Makes RMP more negative B. Makes RMP less negative
33 Explain how the transmission of an action potential would be impacted if voltage-gated calcium channels could not open. In your answer, explain the usual process ofhow an action potential is transmitted from one neuron to the next neuron.Answer in a sentence format.
An action potential Membrane potential (mV) -40 40 -65 II -80 0 -Overshoot Rising Falling phase phase III Voltage threshold Resting potential Undershoot 1 2 3 4 Time (ms) In the figure above, which arrow best represents the point where the voltage-gated sodium channels are inactivated and locked? OI ○ III O IV ○ II
neurotransmitters 1 In what way may drugs be used to affect neurotransmitters? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. A drug may prevent the binding of a neurotransmitterto a receptor. b, A drug may increase the amount of neurotransmitter released. A drug may prevent the release of aneurotransmitter, d. A drug may affect the degradation of a neurotransmitter Drugemay affect neurotranemitters usng al of the mechanismslsted. Unanswered
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