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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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10:39 A N a
E BIO 141 Flnal Essay
1. Please draw the action
potential graph (label
everything) and describe
what happens to the cell
membrane during an action
potential. I need ion flow in
sequence and charges across
the membrane, as well as a
description of what is going
on at each stage (ex. Name
of the stage, which ion gates
are open, which wat ions are
flowing).
II"
Transcribed Image Text:LTE
10:39 A N a
E BIO 141 Flnal Essay
1. Please draw the action
potential graph (label
everything) and describe
what happens to the cell
membrane during an action
potential. I need ion flow in
sequence and charges across
the membrane, as well as a
description of what is going
on at each stage (ex. Name
of the stage, which ion gates
are open, which wat ions are
flowing).
II
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- 9. You are performing an experiment at with an artificial membrane (i.e not a living cell). You place a NaCl solution on each side of the membrane. You discover that if you place a 10-fold NaCl concentration gradient across this membrane (higher NaCl concentration outside than inside) you initially see a +20 mV membrane potential develop. If the Cl permeability is assigned a value of 1, what value would you assign to the Na" permeability? Assume 2.3RT/F = 60 mV.arrow_forwardThe resting voltage of the cell membrane: O is a property of the cell O is generated by mechanically-gated channels, voltage-gated channels, and ligand-gated channels O is defined by the difference in overall ionic charges between the two sides of the membrane O has a negative value at rest in all cells except neurons O all of the abovearrow_forwardMembrane Potential (mV) The Action Potential 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- 0 H [T E 2 F 3 Time (ms) G 4 5arrow_forward
- 7. When the absolute threshold is reached, _______________________ allowing a rapid influx of positively charged sodium ions and changing the membrane potential of the neuron from -70mV to +40mV.arrow_forward7. Draw a standard action potential compared to an action potential whose voltage gated potassium channels have been inactivated with tetraethylammonium (TEA). a. Draw the curves. Label all axes. b. Describe how and why they are different.arrow_forward9. If sodium permeability (Pna) increases compared to normal, what is the effect on the membrane potential? (determine: change in charge on the inside of the membrane and polarity)arrow_forward
- 6. If the action potentials shown in the diagram below occur sequentially and in close temporal proximity, what will be the final result in cell D? In this notation, < indicates an excitatory an inhibitory synapse. Focus on overall effects – excitation and inhibition – don't worry about quantifying responses here. (Hint: you may want to identify what is happening at each cell and then how that will be affected by the activation of the previous cell) synapse and indicates Above Above threshold stimulation Above threshold stimulation threshold stimulation Darrow_forwardThere is no inward current at a membrane potential of +65mV because: The membrane potential is near or at the equilibrium potential for Na+ The membrane potential is near or at the equilibrium potential for neither Na+ or K+ The membrane potential is near or at the equilibrium potential for both Na+ and K+ The membrane potential is near or at the equilibrium potential for K+arrow_forward
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