BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 42, Problem 1DA
Data analysis Draw the resulting potentials for all possible combinations of E1, E2, and I.
Expert Solution & Answer
Summary Introduction
To draw: The illustration for resulting potentials for all possible combination of E1, E2 and I
Introduction: The graded potential arises during resting, depolarization, and action potential. The gated channels help in the movement of ions from the extracellular region to the intracellular region.
Explanation of Solution
The graded potential (mV) in the axonal membrane is shown below:
- 1-represents the weak excitation (E1)
- indicates the stronger stimulus (E2)
- represents the inhibitory stimulus (I) produced by the hyperpolarization.
- represents the sum of all resulting graded potential
Pictorial representation: Fig 1 represents resulting potentials for all possible combinations.
Fig 1: represents resulting potentials for all possible combinations.
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Students have asked these similar questions
With regard to Na+ and K+ equilibrium potentials and the resting and active membrane potentials, write down (a-
D the directions of the forces indicated, acting on the ion in the table below under the respective condition(s). NB
the examples given.
lon
Condition
Electrical/Chemical force
Direction of force
Chemical
e.g....inward..
******
Na
ENa+ = + 60 mV
Electrical
a.
Chemical
e.g. ...outward..
EK+ =- 90 mV
Electrical
b.
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C.
Na"
Emp = 0 mV
Electrical
d.
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K+
Emp
=-20 mV
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A
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OUTSIDE
CELL
This cell is at rest.
False
INSIDE
CELL
C D
T
E
At the peak of the action potential, Vm is approximately -65 mV. Assuming normal intracellular and extracellular K+ concentrations (refer to the table),
(1) calculate the driving force (in mV) that acts on K+ ions
and
(2) use the information obtained in part 1 to determine the direction in which K+ ions will flow (i.e., into the cell or out of cell)
Chapter 42 Solutions
BIOLOGY
Ch. 42.1 - Differentiate between subdivisions of the...Ch. 42.1 - Prob. 2LOCh. 42.1 - Explain the roles of the different nervous system...Ch. 42.2 - Contrast the relative concentrations of important...Ch. 42.2 - Prob. 2LOCh. 42.2 - Prob. 3LOCh. 42.3 - Prob. 1LOCh. 42.3 - Prob. 2LOCh. 42.3 - Prob. 3LOCh. 42.4 - Prob. 1LO
Ch. 42.4 - Prob. 2LOCh. 42.4 - Prob. 3LOCh. 42.5 - Describe the organization of the peripheral...Ch. 42.5 - Prob. 2LOCh. 42.5 - Prob. 3LOCh. 42.5 - Prob. 4LOCh. 42 - Data analysis Draw the resulting potentials for...Ch. 42 - Prob. 2DACh. 42 - Which of the following best describes the...Ch. 42 - The ____ cannot be controlled by conscious...Ch. 42 - Prob. 3UCh. 42 - Inhibitory neurotransmitters a. hyperpolarize...Ch. 42 - White matter is ______, and gray matter is...Ch. 42 - During an action potential a. the rising phase is...Ch. 42 - Prob. 7UCh. 42 - Imagine that you are doing an experiment on the...Ch. 42 - The Na+/K+ ATPase pump is a. not required for...Ch. 42 - Prob. 3ACh. 42 - The following is a list of the components of a...Ch. 42 - Prob. 5ACh. 42 - As you sit quietly reading this sentence, the part...Ch. 42 - G proteincoupled receptors are involved in the...Ch. 42 - Tetraethylammonium (TEA) is a drug that blocks...Ch. 42 - Describe the status of the Na+ and K+ channels at...Ch. 42 - Describe the steps required to produce an...Ch. 42 - Prob. 4S
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- Conditions: [Na+] outside = .3 mM [Na+] inside the presynaptic cell = .01 mM [dopamine] inside = .5 mM [dopamine] outside = .001 mM ΔGinward = RT ln [X] inside/[X] outside + z F Vm F = 23,000 cal/mol V R = 1.987 cal/ mol K Membrane potential is .07 V Temperature is 273 K Using the attachment and information above, please answer the following questions below: ( Is the concentration of dopamine higher on the inside or the outside of the presynaptic cell? SHOW your work. 2.) Would the movement of dopamine INTO the presynaptic cell be active or passive? SHOW your work.arrow_forwardName the three phases of an action potential. Describe for each the underlying molecular basis and the ion involved. Why is the term voltage-gated channel applied to Na+ channels involved in the generation of an action potential?arrow_forwardIs an action potential more or less likely under these conditions? Explain.arrow_forward
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