Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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During an Action Potential…..
- _____ Na+ flows out of the cell
- _____ Na+ activation gates and inactivation gates are both open
- _____ Na+ flows into the cell
- _____ Calcium flows out of the cell
- _____ K + gates are open
- _____ Na+ activation gates are closed
- _____ Na+ inactivation gates are closed
- _____ K+ flows into the cell
- _____ K + gates are closed
- _____ Na+ activation gates and inactivation gates are both closed
- _____ K + flows out of the cell
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- 3) Neurons cannot respond during the absolute refractory period because: a) the concentration gradients for Na+ and K+ are reversed. b) the cell is below its normal resting membrane potential. c) voltage-gated Na+ channel activation gates are closed. d) voltage-gated Na+ channel inactivation gates are closed.arrow_forwardWhich of the following is not a way neuroglia cells help neurons? A. Provide support and protection B. Speed up electrical signals C. Provide nutrients D. Send electrical signals themselvesarrow_forwardThe resting membrane potential…A) Can be approximated using the Nernst equation.B) Is established by a difference in charges across the cell membrane, with the inside more positive than the outside.C) Has no influence on the driving force for flow of a particular ion across the cell membrane.D) Is more dependent on the passive flow of potassium vs. sodium ions through leak channels across the cell membrane.E) Stays the same during an action potential.arrow_forward
- What accounts for the resting membrane potential seen inunstimulated nerve and muscle cells?arrow_forwardFill in the blank Glial fibrillary acidic protein (GFAP) is a type III intermediate filament protein that is expressed by.........arrow_forwardWhy is the resting membrane potential negative? Shouldn't it be positive as cells move in and out positive ionsarrow_forward
- 8) The diffusion of K+ out of the cell makes the inside of the cell less positive, or more negative, and acts to restore the original resting membrane potential. This process is called: a) depolarization b) hyperpolarization c) repolarizationarrow_forward6. Please help answer all parts to this question, thank you so much!! :)arrow_forwardWhat is the difference between the membrane potential in a normal cell and an excitable cell?arrow_forward
- The input region lacks _________________, but contains _____________________, Group of answer choices A. Ligand-gated channels, voltage gated channels B. K+ leak channels, voltage gated channels C. Voltage-gated channels, ligand gated channels D. Ligand-gated channels, K+ leak channelsarrow_forwardThe stage of the action potential that is shown below is ____________ the very end of the action potential repolarization resting potential depolarizationarrow_forwardWhy is the sodium-potassium pump indirectly important to the ac-tion potential and to maintaining the resting membrane potential?arrow_forward
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