thresholdresting membrane potentialdecreasecalcium channelsincreaseaction potentialsThe autonomic nervous system influences the heart rate. A sympathetic signal (norepinephrine) results inopening. Thisaccelerates the process of reachingthereby resulting in ain time between successive actionpotentials. A parasympathetic signal (acetylcholine) results in thedropping to -70mV. This results in anin time for cells to reach threshold, thereby increasing the time between successive

Introduction: The action potential is the short series of events in the membrane potential that…

Answered: threshold resting membrane potential…

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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rearrange these in the correct order of events in an action potential.
Activation of what receptor directly causes stimulation of the heart? Alpha-1 alpha-2 beta-1 beta-2 Brta-3
How would antibodies against nicotinic acetylcholine receptors (nAChRs) affect the influx of sodium (Na+) into a skeletal muscle cell? Group of answer choices These antibodies would target nAChRs for destruction leading to lower sodium influx in muscle cells. These antibodies would target nAChRs, changing their shape to allow calcium instead of sodium through. These antibodies would target nAChRs, changing their shape to allow only potassium through. These antibodies would target nAChRs aiding acetylcholine in its binding to receptors, leading to increased sodium influx in muscle cells. pick one answer
Conduction velocity refers to the [a] at which an action potential travels along a neuron's axon. In invertebrates, conduction velocity can only be increased by [b]. However in vertebrates (exclusively), such as humans, conduction velocity can also be increased by [c]. This enables vertebrates to conserve [d] while still increasing conduction velocity. [a] [b] [c] [d] [Choose ] [Choose ] [Choose ] [Choose ]
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.
What is the arrow identifying in the picture below? soma dendrite O action potential Oaxons axon hillock < Previous M
1.25 p Question 22 Which statement below best describes why action potentials travel in only one direction? O The all-or-none principle explains this. O They have a refractory period. O The diameter of the axon explains this. O Only sodium- and potassium-gated channels are found on the axon. O They have myelinated axons. • Previous Next Not saved Submi
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
Nervous Tissue electrical and chemical disequilibrium across cell membranes equilibrium potential calculating the equilibrium potential using the Nernst Equation The parameters of the Goldman Equation the reason for a -70mV resting'potential in most excitable cells gated channels particulars Defining depolarization, repolarization and hyperpolarization defining the role for the common ions, (K+, Na+ )special ions Cl, Ca+ have Define Current and ohm's law l=V/R Defining graded potentials and particulars about graded potentials such as subthreshold GP o suprathreshold GP temporal summation spatial summation e1 of 2 418 words English (United States) O Focus B I @ #3 24 & * 3 4 7 8
Identifying Neurotransmitters 3) Produces response in postsynaptic cell - Qualifying condition: Molecules evoking same response as neurotransmitters Presynaptic terminal Postsynaptic. dendrite Drug-containing micropipette (753) Apply drug by passing electrical current Stimulate axon Record V Drug application through the micro-pipette Stimulated neurons Change in membrane potential AVm Outcome 1 Outcome 2 Outcome 3 0 -30 mV 15 mV 0 -15 mV -15 mV What is the interpretation of the above results?
During the action potential waveform, the voltage returns to the resting membrane potential at -70mV through the: closing of potassium channels. opening of chloride channels. O opening of sodium channels. opening of potassium channels.
The next patient seen by the same doctor was suffering from hyperkalemia and was experiencing cardiac arrhythmias. Which of the following reason/s explain/s why this patient was experiencing cardiac arrhythmias? O hyperkalemia leads to an increase in action potential generation because potassium ions in the ECF makes the resting membrane potential more negative O hyperkalemia leads to a decrease in action potential generation because the potassium ion level in the ICF will cause hyperpolarization O hyperkalemia leads to an increase in action potential generation because the high level of potassium ions in the ICF will make achieving threshold easier O a and b

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