General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
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Question
Chapter 18, Problem 8E
(a)
To determine
The space parameter of myelinated axon of radius
(b)
To determine
The space parameter of unmyelinated axon of radius
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Students have asked these similar questions
Assume an axon has the same characteristics as the class example
except the radius of the axon is 0.005 mm and the membrane
thickness is 20.0 nm. The percentage fractional change in the
concentration of Na+ ions in the axon during one action potential is
%? Record the answer to the nearest one
thousandth.
What is the magnitude of the electric field across an axon membrane 1.2×10−8 m thick if the resting potential is -70 mV ?
The velocity of spike propagation is proportional to the following combination of factors:
1
a
C, V R„R,
m
Where a is the radius of the axon, Rm and R; are specific resistances of the membrane and the
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Chapter 18 Solutions
General Physics, 2nd Edition
Ch. 18 - Prob. 1RQCh. 18 - Prob. 2RQCh. 18 - Prob. 3RQCh. 18 - Prob. 4RQCh. 18 - Prob. 5RQCh. 18 - Prob. 6RQCh. 18 - Prob. 7RQCh. 18 - Prob. 8RQCh. 18 - Prob. 9RQCh. 18 - Prob. 10RQ
Ch. 18 - Prob. 1ECh. 18 - Prob. 2ECh. 18 - Prob. 3ECh. 18 - Prob. 4ECh. 18 - Prob. 5ECh. 18 - Prob. 6ECh. 18 - Prob. 7ECh. 18 - Prob. 8ECh. 18 - Prob. 9ECh. 18 - Prob. 10ECh. 18 - Prob. 11ECh. 18 - Prob. 12ECh. 18 - Prob. 13ECh. 18 - Prob. 14ECh. 18 - Prob. 15ECh. 18 - Prob. 16ECh. 18 - Prob. 17ECh. 18 - Prob. 18ECh. 18 - Prob. 20ECh. 18 - Prob. 21ECh. 18 - Prob. 24ECh. 18 - Prob. 25ECh. 18 - Prob. 26E
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Similar questions
- a) How does voltage change over distance from the stimulator on the artificial axon? AND why does this occur? (Think: where is the current going?) b) How and why are neurons affected by the addition of myelin (think membrane resistance, capacitance, and the length constant)?arrow_forwarda) What was the smallest voltage required to produce a contraction (the threshold voltage)? What proportion of the fibers in the muscle do you think were contracting to produce this small response? b) What was the smallest voltage required to produce the maximum (largest) contraction? What proportion of the fibers in the muscle do you think were contracting to produce this maximal response?arrow_forwardHow many actin monomers within an actin filament would a myosin molecule need to ratchet in order to contract a cell by approximately 1 μm? How fast could a non-muscle cell make this contraction compared to a muscle cell if the relative rates of myosin walks on F-actin are 4.5 μm/sec and 0.04 μm/sec for myosin II and I respectively?arrow_forward
- What is the magnitude of the electric field in unite of N/C across an axon membrane (1.00x10^0)x10-8 m thick if the resting potential is -(7.400x10^1) mV?arrow_forwardFind the radius of the unmyelinated axon (m) with space parameter A = 14 mm, (Resistance of a unit area of the membrane, Rm =0.2 Q.m², Resistivity of axoplasm, p, =2 Q.m). A. 0.00392 B. 0.01568 C. None D. 0.02352 E. 0.00784arrow_forwardWhen the arteries get narrow the resistance to blood flow decreased and pressure decrease. True O Falsearrow_forward
- (III) During an action potential, Na* ions move into the cell at a rate of about 3 × 10-7 mol/m² - s. How much power must be produced by the "active Na* pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 10 cm long and 20 µm in diameter.arrow_forwardwhat is the ans of 11-15?arrow_forwardAnswer only for c1 (i)arrow_forward
- Dont give me scietific notations. Consider the tolerancearrow_forwardQuestion 7 50 40 40 Peak action potential Depolarization Repolarization 0.2/0.5 points Membrane potential (mV) 0 - Threshold of excitation -50 Initial stimulus -70 resting hyperpolarization resting return to resting -100 When are voltage gated Na+ channels closed (and inactivated)? The different ranges provided start at resting, go through an AP, and end at resting. (-70mV to -50mV) (-50mV to +40mV) (+40mV to -70mV) (-70mV to -80mV) (-80mV to -70mV)arrow_forwardE13P11arrow_forward
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