Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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During depolarization, the membrane potential becomes more positive.
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- An increase in the magnitude of depolarization by a graded potential will increase the threshold potential increase the duration of an action potential increase the frequency of action potentials two of the abovearrow_forwardA A Aa v Ao O... 11 AaBbCcDdEe AaBbCcDc AaBbCcDdE AaBb( AaBbCcDdEE AaBbCcDdEe U v ab A ev A v X, Normal No Spacing Heading 1 Heading 2 Title Subtitle temporal summation spatial summation Unidirectional and non-degrading Action potential o Depolarization; Na gates opening o Repolarization: K gates opening o Hyperpolarization: K gates closing Movement down an axon Refractory periods Myelin and Axon size effect Action potential stimulated release Neurotransmitter (NT) recycling Neurotransmitters o Acetylcholine Biological amines (Serotonin, norepinephrine and epinephrine) Single amino acids (Glutamate and GABA) Fast and Slow effects and Receptor effects The Autonomic System Division definitionarrow_forwardAnswer to question 6 pleasearrow_forward
- The patient's muscle weakness, dizziness, and nausea are all due to hypokalemia. How does hypokalemia lead to muscle weakness? O hypokalemia leads to hypopolarization which results in fewer action potentials arriving at skeletal muscles O hypokalemia leads to hyperpolarization which results in fewer action potentials arriving at skeletal muscles O hypokalemia leads to hypopolarization which leads to too many action potentials arriving at skeletal muscles O hypokalemia leads to hyperpolarization which results in too many action potentials arriving at skeletal musclesarrow_forwardNervous 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 8arrow_forwardUnder what conditions could the opening of a chloride channel actually depolarize a neuron rather than hyperpolarize it? i. The neuron is resting at -75 mVii. The extracellular chloride concentration is lower than the intracellular chloride concentrationiii. The neuron is close to its threshold of -55 mVa. i onlyb. iii onlyc. i and ii onlyd. ii and iii onlye. i, ii, and iiif. None of thesearrow_forward
- If the resistance of the neuronal membrane goes from 250 Mᘯ to 500 Mᘯ, which of the following is most likely to occur? Current will doble Current will quadruple Current will decrease by half Current will increase by 1/4tharrow_forwardCompare the sodium current and potassium current when membrane potential is below the reversal potential, at the reversal potential and above the reversal potential of ACh current.arrow_forwardWhat statement is NOT true about the length constant? is the distance along the dendrite from the site of current input to the site where Vm has decayed by 37% the decay of current by 37% over a specific segment along an axon the decay of membrane potential as a function of membrane and axial resistances the passive decay of current over distancearrow_forward
- What does the sodium-potassium pump do to reset and maintain resting potential? Inwhat sense is this an active transport mechanism?arrow_forwardIf a resting potential becomes more negative, the membrane is said to be __________.arrow_forwardDefine depolarization, repolarization, and hyperpolarization in terms of how it affects the membrane potential of an excitable cell.arrow_forward
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