General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
expand_more
expand_more
format_list_bulleted
Question
Chapter 18, Problem 15E
To determine
The number of sodium ions.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
12. (a) Using Eq. AQ=CAV and the data in the Table, calculate the number of ions entering the axon during
the action potential, per meter of nonmyelinated axon length. (The charge on the ion is 1.6 x 10-19 coulomb.)
(b) During the resting state of the axon, typical concentrations of sodium and potassium ions inside the axon
are 15 and 150 millimole/liter, respectively. From the data in the Table, calculate the number of ions per
meter length of the axon.
Table 13.1 Properties of Sample Axons
Hint:
1 F (farad) = 1coulomb/1 volt
Property
Nonmyelinated axon
Myelinated axon
Axon radius
5 x 10-m
5 x 10-6 m
1 mole /liter = 6.02 x 1020 particles (ions, atoms, etc. ) Resistance per unit length of fluid
cm
6.37 x 10°2/m
6.37 x 10°2/m
both inside and outside axon (r)
Conductivity per unit length of
axon membrane (gm)
1.25 x 10-4 mho/m
In the resting state, the axon voltage is -70mV.
During the pulse, the voltage changes to about
+30mV, resulting in a net voltage change across
the membrane of 100…
How 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?
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 ?
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
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- 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 internal buffer, respectively. If we double the radius and simultaneously increase the concentration of salt inside the axon twice (i.e. R; decreases two times), by how many fold will the velocity change?arrow_forwarda) 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_forward
- A rod shaped virus has a diameter of 1*102 nm and a length of 5*102nm.What is the volume of the virus in units of μm3arrow_forwardHeight velocity graphs are used by endocrinologists to follow the progress of children with growth deficiencies. The figure below shows the height velocity curves of an average boy and an average girl between ages 3 and 18. y (cm/yr) 10 8. 6. 4. 2. x (years) 2 4 6 8 10 12 14 16 18 (a) Which curve is for girls and which is for boys? The blue curve is for girls and the black curve is for boys 6. APR 5 66 14 étv 280 MacBook Pro.arrow_forwardWhat 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_forward
- How many 6.60 × 10−6 m long red blood cells stack up to be the thickness of a single sheet of 1.0 × 10−4 m thick paper?arrow_forward| Va -Vc |arrow_forwardEverett DeGolyer coined the term "energy slave" before the Great Depression to show that because of coal and oil, the United States led the world in per capita energy consumption. The average electrical consumption of an American residence 1500 kilowatt hours for a single family dwelling. If 10,460 kilojoules is the energy expended each day by a person and of that total 10,460 kilojoules, 80 % is used for basic metabolism, how many energy slaves does the typical American use? Group of answer choices: A. 10 B. 17 C. 85 D. 100arrow_forward
- When the arteries get narrow the resistance to blood flow decreased and pressure decrease. True O Falsearrow_forwardWhen does an object have a store of GPE?arrow_forwardOxygen reaches the veinless cornea of the eye by diffusing through its tear layer, which is 0.500-mm thick. How long does it take the average oxygen molecule to do this?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College
DC Series circuits explained - The basics working principle; Author: The Engineering Mindset;https://www.youtube.com/watch?v=VV6tZ3Aqfuc;License: Standard YouTube License, CC-BY